Sunday, August 28, 2011

Essential Computer Support - Anti-Virus and PC Tune Up


Online computer support service is the best way for average computer user to get computer support services. These computer troubleshooting services come under remote technical support. Online PC support is very good option for repair, maintenance and updates of your computer.

There are three different types of online PC support services -

1. Email support - You can send an email to seek computer tech help
2. Telephone support - You can call the technicians to get computer tech help
3. Chat support - You can also chat with the technicians for discussing the problems

The basis for remote technical support is that users get connected to the experienced technicians who then get an access to user's computer through remote desktop. They then diagnose and troubleshoot the problems encountered by the users'. Today, online PC support is provided by professionals certified by Microsoft. They employ latest technology for analyzing the situation and providing guidance. There are host of companies that provide online computer support services to people struggling with the computer related problems.

There are many advantages of computer support services. You get the service from the convenience of your home or office. You need not be concerned about calling a technician or taking your computer to repair shop. Moreover, technicians are available 24/7 to help you and handle your concern. These companies provide PC tune up services and are also helpful in installing latest version of anti - virus software.

PC tune up will easily guide you about the process of repairing the slow speed of your computer and enhancing its performance. PC tune up is highly efficient and effective tool for troubleshooting the slow speed of computer. Basic PC tune up services includes the following services -
1. Removing software applications which are of no use
2. Defragmentation of program and scanning hard drive
3. Updating anti - malware software
4. Installing security patches
5. Windows firewall configuration
6. Deleting cookies and unwanted temporary files

Read more: http://goo.gl/qqDva

Monday, August 22, 2011

Computer Support - Anti-Virus and PC Tune Up


Online computer support service is the best way for average computer user to get computer support services. These computer troubleshooting services come under remote technical support. Online PC support is very good option for repair, maintenance and updates of your computer.

There are three different types of online PC support services -

1. Email support - You can send an email to seek computer tech help
2. Telephone support - You can call the technicians to get computer tech help
3. Chat support - You can also chat with the technicians for discussing the problems

The basis for remote technical support is that users get connected to the experienced technicians who then get an access to user's computer through remote desktop. They then diagnose and troubleshoot the problems encountered by the users'. Today, online PC support is provided by professionals certified by Microsoft. They employ latest technology for analyzing the situation and providing guidance. There are host of companies that provide online computer support services to people struggling with the computer related problems.

There are many advantages of computer support services. You get the service from the convenience of your home or office. You need not be concerned about calling a technician or taking your computer to repair shop. Moreover, technicians are available 24/7 to help you and handle your concern. These companies provide PC tune up services and are also helpful in installing latest version of anti - virus software.

PC tune up will easily guide you about the process of repairing the slow speed of your computer and enhancing its performance. PC tune up is highly efficient and effective tool for troubleshooting the slow speed of computer. Basic PC tune up services includes the following services -
1. Removing software applications which are of no use
2. Defragmentation of program and scanning hard drive
3. Updating anti - malware software
4. Installing security patches
5. Windows firewall configuration
6. Deleting cookies and unwanted temporary files

Besides providing PC tune up services, online computer support providers also provide security to your computer system against malware attacks. Viruses are malicious programs that can cause huge damage to your computer system. Viruses and malwares are common causes which results in slow speed of computer. These viruses can also corrupt your important files. It is therefore advised to seek security against viruses. Online PC support provider useful services like firewall configuration, installation and configuration of anti - virus software, regular PC security check and conducts automatic schedule tasks for virus scanning and its removal.

Source: http://goo.gl/8mtyC

Monday, August 15, 2011

Compare and view - Computer Support


Computers are electronic devices, which can store and process large volumes of data, with great speed and accuracy. All of us are pretty well acquainted with this definition of computer. But many do not know that this definition tends to vary with the passage of time. It might sound a little bit bizarre, but a deeper analysis will show that it is true.

A computer is a delicate and sophisticated electronic device, which needs regular care and maintenance in order to perform as per the above definition. 'Speed' and 'accuracy' are the prime virtues of a computer. But a computer tends to lose its prime virtues if its share of care and maintenance is neglected by the owner. But it is difficult for an amateur user to maintain and upkeep his /her computer on his/her own, as they require technical knowledge. Therefore, it is advisable that such an user should avail computer support service.


Importance of Computer Support

Most users are not aware of the importance of computer support. They treat it as an extra financial burden, which comes with the huge cost of buying a computer. Moreover, the warranty period served by the brand owners, gives them a false sense of security, due to which they do not bother to avail any sort of the same. But it is indeed more than just a necessity. It deals with, and resolves a lot of issues related to computers and its peripherals. Its versatile range of services include speeding up slow PCs, healing computers from virus and spyware threats, solving problems related to sending emails or attaching files with emails, issues with configuring internet setup, MS Office Support, XP Installation, Windows Vista Upgrade, Windows Vista Installation, Printer and Scanner issues, Parental Control, Data Backup, Wi-Fi Support, Windows 7 Support, and many more.

Types of Computer Support

In general, there are two types of computer support which users mostly avail, namely- Onsite Support and Remote Support/Online Support. For those who are not acquainted with these two terms, Onsite Support is the conventional support which is provided to the customer by the service provider, by physically paying a visit to the house of the same. Whereas, in case of Remote Support/Online Support, the service provider gets to share the customer's computer via the internet, and all the queries of the latter are solved through the same medium.

Advantages of Remote Support

1. Customer gets instant solutions to all kind of technical problems. It also saves lot of valuable time.
2. Services available 24X7
3. Much cheaper than Onsite Support

Disadvantages of Remote Support

1. Customer doesn't get to converse with the technician face to face. As a result, the customer may not be able to explain the problem properly.

Therefore, it may be concluded that if you are looking for instant, economic solutions, go for remote support. If money or time is not an issue, go for onsite support.

Christie Hemme, 27, is one of the most celebrated technical expert of http://www.pccarencure.com/. She hails from Canberra, Australia. She had been an erudite scholar in the University of Melbourne, where she completed her M.Tech in Information Technology. Her thirst and impetus for technical knowledge, and spontaneous flair for writing tech articles has made her pursue her career in this field.

Advantages of Onsite Support

1. Customer gets to converse with, and explain the problem to, the technician face to face.
2. The technician also gets to resolve the issue more conveniently as he/she physically pays a visit to the customer's house.

Disadvantages of Onsite Support

1. It is highly time consuming, as the customer needs to fix a date which is convenient to both the customer and the technician.
2. As the technician pays a visit to the customer's house, the cost of servicing increases.

Tuesday, August 2, 2011

Request a Mac Repair Online


These are steps for Request a Mac Repair Online

Find the serial number for your Mac computer. The location varies by computer, but it is under the keyboard or battery on some laptops and on the bottom of some desktops. Check your computer documentation to see whether the serial number is listed there, perhaps on the original purchase receipt.

See whether you can request a Mac repair online for your computer by checking the list at the Apple Service Depot (see Resources below). Only certain types of work and defective part exchanges can be requested online.

Click the appropriate section for your Mac at the Service Depot. You'll need to enter your computer's serial number, your country location and choose a language preference before proceeding to the Terms and Conditions page. Read and agree to the repair conditions in order to continue.

Sign in to the Service Depot. You can use your .Mac account or your Apple Store ID to log in. Next, you need to verify the computer's serial number and date of purchase.

Fill out the problem you're having with your Mac computer. There may be a few common symptoms listed, but try to be as specific as possible. Next, you'll need to confirm your delivery and pickup addresses to ship your computer for repair.

Enter your billing information and address.

Submit the repair request and wait for it to be processed by an Apple representative. You may be given the option to mail in your computer, drop it off at an Apple store or have a replacement part mailed to you. Be sure to check the email address that is linked to your Apple ID or .Mac account.


Read more: http://goo.gl/3JHHi

Friday, July 22, 2011

Online Computer Fix Programs


Computer owners may experience a variety of issues, ranging from slow computers to virus infections. Fortunately, there are several online solutions that can allow a user to fix a problem himself or to employ the assistance of a remote computer technician to repair the computer. These utilities include virus scanners, hard drive analyzers, remote access companies and a variety of computer repair tutorials.


PC Pitstop

PC Pitstop provides visitors with several computer scanning services. One program called Exterminate scans for and repairs infection from malicious software, also known as malware. In addition to this, Disk MD is a utility that scans the user's hard drive to create a report that includes the largest files, the most fragmented files, a free-space analysis and a composition report, which details the types and percentages of files on the hard drive. The user must first download an installation file to run either of these scans.

Computer Geeks Online

Computer Geeks Online can provide computer support and repairs through a remote access program via the Internet. Computer users must first call the company to become a customer; Computer Geeks online does not provide services for free. Instead, this company functions as an alternative to calling a computer technician or sending the computer to a repair facility. Computer Geeks Online requires the computer to be in working condition with an Internet connection; the technicians cannot replace physical hardware.

Free Computer Zone

While Free Computer Zone does not provide online computer maintenance or repair tools, it does provide tutorials for computer owners to improve the performance of their computers. Windows users will especially benefit from explanations of native Windows tools, such as the disk checker or disk defragmenter. Free Computer Zone also suggests free tools that the computer user can download to combat spyware and viruses, delete unnecessary data, or back up data. Free Computer Zone offers information pertinent to computer security as well as performance, and it is written in a style that even computer novices can understand.


Read more: http://goo.gl/9CPve

Monday, July 18, 2011

How to Clean a Virus Online ?

A computer virus is a piece of software designed to complete a malicious task. For example, a computer virus may slow your computer, delete or modify your files, disable your disk drives, prevent you from accessing your antivirus programs, flood your computer with error messages, distort your operating system menus and cause your computer to crash. Fortunately, there are free online resources available to help you clean computer viruses from your computer, reports Microsoft Support.

Instructions

Automatic Removal


Open your antivirus program. If you do not have an antivirus program, consider downloading a free antivirus program, such as Windows Defender or AVG or Avast (linked in Resources below).


Update your antivirus program. Out-of-date antivirus programs cannot detect and delete new viruses. If you do not know how to update your antivirus program, consult the manufacturer's homepage.


Run a full scan of your computer using your antivirus program. Most antivirus programs give you the option of running a full scan or a quick scan. A full scan searches your entire computer for viruses. A quick scan covers only the areas where viruses are most commonly found. Running a full scan of your computer using an up-to-date antivirus program should remove the virus from your computer. If it does not, you will have to remove the virus manually.


Read more: http://goo.gl/7u17N

Sunday, July 10, 2011

How Can You Select the Perfect Online Computer Support Company

If you are frequently using the computer then you must be quite familiar with the frustrating and super-irritating feeling that comes when one is in the middle of something really important and there is some or the other technical snag that forces the computer to stop functioning properly. However, this is precisely where online computer support comes to the aid of the user. This pseudo remote backup is just what the doctor ordered when it comes to resolving even the hardest of issues on the spot.

Online computer support is indeed a very quick and sure shot method of getting the job done without you having to personally carry the notebook or PC to a computer repair shop. All that is needed is a reasonable internet connection and you're done! This revolutionary concept is based completely on this omnipresent technology, and this is what makes it so special and convenient for office as well as personal use.

One must also keep in mind that telephonic conversation might also be resorted to in case of sever problems, but that is about it. All your problems are going to be solved in a remote fashion with this service. Although hardware issues are a bit of concern in this regard, online computer support is flawless when it comes to software problems, which are, quite frankly, the major areas of concern.

Selecting the perfect one from the many companies that offer this service is easier said than done, since there are so many options available. However, the perfect one for you must be a combination of the expertise you need at a competitive rate. One can easily search for such agencies and request for a quote as well as personally talk with them regarding the skill level of the technicians. Usually, these are Microsoft certified ones, so there's really no problem as far as safety is concerned. Once you have chosen a few of the agencies on the basis of the quality of service, you just need to select the one that gives you the best value for money, and hire it to give you uninterrupted computer support every day.

Source: http://goo.gl/2yvGb

Monday, July 4, 2011

Onsite Vs. Online Computer Support- Which Is Better?

Many of our day to day activities are dependent on computers. Most people cannot afford to have a malfunctioning computer. And no matter what methods of prevention you do to stop your computer from malfunctioning, it cannot be avoided. When this happens, you have a few choices to either have it repaired through an online computer repair company, by manually hauling the computer into your nearest computer repair shop or having a computer repair technician visit your home.

If you are confused on which methods are better, it is always best to compare the benefits of each type of computer repair saving you money and time.

The most common way to fix a computer involves hauling your computer down to the nearest repair shop this method is the most time consuming and physical constraining. When a computer technician goes to your home or office, this is considered as onsite computer repair. This type of repair is usually best when the issue is a hardware problem since they can personally inspect the malfunctioning parts. The biggest disadvantage is that it is the most costly. The technician has to spend time driving to your home and in some case back to the repair shop and back again, most technicians are charged by the hour so this method would be the most expensive, onsite repairs may take longer for the repair as customers must wait until a technician is available to drive to your home and even longer if the repair requires the computer to be taken back to the office, then finally bring it back home provided that the technician has time to fix it right away or if there are no other customers waiting.

Another disadvantage of onsite computer repair is that you can never be sure if your computer is in the hands of an expert. This is perhaps one of the biggest advantages of an online computer support. Most online computer support companies are strict when it comes to hiring their technicians. To make sure that they provide the best service to their customers, they hire and train their technicians to become experts on Apple, Microsoft, Red Hat Certified, CCNA experts and more. So no matter what computer you have, whether it is a PC or MAC, customers can be sure to get the best service by knowledgeable experts in the computer field.

Online computer support is the most convenient type of computer repair as you don’t have to leave the comforts of your own home to have your computer fixed. Here, you don’t have to manually haul your computer to a computer shop. The computer repair technicians will help you fix your computer remotely or by telephone. Your computer can be fixed instantly even if it’s at out of office times since most of the online computer repairs companies are open 24/7. Depending on the severity of your computer, it can be fixed in a span of five minutes to just a couple of hours- no need to wait for days.

Online computer support technicians will fix your computer through remote support. So you can see what they are doing right before your very eyes. They can also explain the steps they are undergoing which is actually a great advantage for you. You not only get your computer fixed but you also get to learn how to fix it in the future. These technicians would also give you advice on how to prevent future issues.

The cost for online computer support is generally more affordable than having your computer serviced by onsite technicians. The next time you experience a computer issue, go for convenience, practicality and fast service. Get in touch with an online computer support right away and see the difference.

Aericle Source: http://www.articledashboard.com/Article/Onsite-vs--Online-Computer-Support--Which-is-Better-/2567136

Tuesday, June 28, 2011

CrossLoop – Online computer support for low rates

Ever have a computer problem you couldn’t fix yourself, but didn’t want to get fixed by your local store for hundreds of dollars? Unfortunately, many people end up paying a lot of money to fix technical problems that they could do themselves, only if someone helped them.

I’ve previously written about online screen sharing and remote desktop apps that allows your friends or family members to connect to your computer and help you solve computer problems. While this is great, not everyone knows a computer geek ready to solve all their problems.

That’s where a service like CrossLoop comes in and saves the day. They are the only company (that I know of) that has a free remote screen-sharing app plus a huge community of “helpers” that can assist you in fixing computer problems for a low price.

HOMEPAGE

Basically, tech savvy people from all over the world create profiles on CrossLoop and then use their client application to log into the system. Here is an example of a helper who has setup a profile on CrossLoop with his expertise and prices for support:

PROFILE

The cool thing is that everyone gets rated after a help session, so you can choose people who are highly rated. You can see where they are from, what languages they speak, how many people they have helped and whether they offer free estimates or not, something the stores usually don’t do!

To get started, all you do is perform a search from their main site and you’ll get a listing of helpers that are currently logged on and that can help you immediately.

SEARCH

You can start up a chat session with the helper to get any info you want or to tell them about your problem. This is great because you can make sure the person really understands your problem before you cough up any cash.

CHAT

Once you finalize everything, the helper will ask you for your sharing code, which is on the Share tab of the CrossLoop client. Just give the person the number and they will be able to connect to your computer and remotely control it.

CLIENT

You can end the session at any time and there is also a 48 money back guarantee, so if the helper couldn’t fix your problem or the problems comes back after the session, your payment will be refunded. Not bad!

Overall, it’s a great way to get cheap computer support without having to leave your home! Enjoy!


Source:-www.online-tech-tips.com

Thursday, June 23, 2011

Online Computer Support

Online Computer Support is the most convenient way to fix your PC issues. The most alluring feature of this mode of computer services is that it is cost effective and time saving. Call MTSS to get the best online computer support to boost up your computer's performance. Apart from offering home computer repair services we also provide business computer support at a very reasonable cost.

We have a team of expert technicians who offer online computer support to set-up, install and customize your PC. Our technicians are quite adept in the computer troubleshooting service. We also provide tech support to repair all issues related to hardware and software. Our online computer support services also include detecting and fixing all the issues that are stopping your computer to perform at its best.

Online Computer Support Services Include
  • Installation, repair and upgrade of the Operating System
  • PC optimization support for the best computer performance
  • Data backup and data recovery support
  • Virus, adware, and spyware removal support
  • Troubleshooting hardware and software issues
  • Troubleshooting internet related issues
  • Tech support for slow PC, registry conflicts, and compatibility issues
Why Us
  • 24/7 support from expert technicians
  • Complete solution for PC issues
  • Assistance through internet and phone
  • Reasonably priced tech support plans
  • Useful software programs absolutely free with every plan
  • Technical Support to keep your PC running fast
Source:-mytechsupportstore.com

Monday, June 6, 2011

Remote Computer Support - A New Standard of Computer Repair

In today's computing world, remote computer support is gaining popularity and undoubtedly, it is here to stay. It is now proven to be the new standard of computer repair for such systems as desktops, notebooks, servers, and connected devices.

The complexity and sophistication of today's technology have finally advanced the way computer service and support are delivered to end-users. Gone are the days whereby if your computer experienced technical issues, you would disconnect it and haul it over to a repair shop down the street where you would be promised to return for a pickup in about 48 to 72 hours, assuming no hardware replacement was needed. But today, that same computer issues can be resolved in about 1 to 3 hours or less via remote computer support accessible 24x7. You no longer need to haul your computer over to a repair shop, rather, computer repair comes to you. That's the "beauty" of today's technology that you and I are privileged to experience!

Remote Computer Support providers can help you troubleshoot and fix your computer problems such as software errors, blue screen of death, boot up errors, slow computers, slow internet connection, system crashes, outdated device drivers, low virtual memory notifications, virus-spyware issues, web browser related issues, browser hijacks, and much more. Also, they can assist with wireless network setup and support, pc tune-up, computer optimization, online data backup, e-mail setup and support, expert software install, virus-spyware removal, windows 7 upgrade advisement, Microsoft windows and office support.

How Remote Computer Support Works!
o You Call the support provider's service center via toll free number
o Your assigned support expert will Connect to your computer via secure internet access
o Your support expert will complete the Service and ensure that your computer is working well again

Read more: http://goo.gl/Zjskf

Sunday, May 29, 2011

Online Computer Support - A Must For Everyone

Generally, people call a computer technician to take care of any issues that arise during normal working with the PC. These might be slow processing, virus attack, hard disk crash, etc. There are also a multitude of hardware problems that not everyone can fully understand, and thus it is required for everyone to have professional help. However, calling a technician often leads to quite a few pain points.

The first issue that you might have with a technician is obviously whether he would always be available or not. This is particularly a major point of concern for people living in remote areas, or in case the problem is such that delay would only make it worse. Since there might be many more households that would require his services, there may be days when you would have to wait for hours and hours together to get him to first have a look at your problem.

The next problem which calls your attention is that your technician might not always be qualified to handle all kinds of problems. This basically means that technology is changing everyday, and your local technician might not be skilled or updated enough to handle all kinds of problems. This might also lead to him further complicating the problem!

The third point of concern could be the fact that he could charge you exorbitantly for services and hardware, marking his own commission in the latter. Since he is a single person with nobody to report to, he might as well charge according to his wish, and in case he knows that you don't have any other option, you are in for a treat!

This is why it is best to go for online computer support services. The professionals are well-trained, which makes them proficient enough to handle all kinds of requirements wart. handling computer-related issues. Further, since they are governed by a company, their charges are fixed, and much lower than independent technicians, thus negating the need for you to pay extra. Finally, since the company has many technicians on its payroll, you would never face a problem related to availability. So what are you waiting for? Go get your computer secure now, with online computer support.

Source: http://goo.gl/7bVbz

Monday, May 23, 2011

Keep Your PC Healthy With Online Computer Support

Computer is a basic requirement nowadays and to meet pace with the modern lifestyle, your computer must be equipped with all the latest advancements and technology.

Computers are borne with few problems occasionally and at those moments online computer support helps you and everybody look for resources providing computer technical support.

Multiple reasons are there due to which popularity of remote computer support model has been increasing rapidly. The prior supportive reason is its reasonable and much cheaper on-site tech support, which saves travel time and cost of fuel as for even minor issues you need to take your computer or laptop to the repair center.

Online support is available 24×7 and all through the year, just required to dial the number of the service provider. And to avail online PC support it is required to pay very small amount for enjoying state of the art diagnostic and troubleshoot service for hassle-free computing.

The support works efficiently for all issues either software or hardware. You require computer to carry normal tasks like browsing the internet, checking your email, using Microsoft office and similar tasks, you just need to ensure that your computer remains updated on the software front. Updating and installing relevant software on your computer will benefit you significantly.

The supports services ensure not only the protection of equipments but also create a back up for your data, and protect your network from cyber crimes such as hacking, e-mail bombing, unauthorized access and virus attacks.

Online computer support services are the most preferred alternative of millions of customers. They assist in fixing all the problems pertaining to your computer at the software end. The most attractive part is its availability which is throughout the day, 365 days an year at relatively cheaper payments.

Online services provide you with every kind of computer services like computer and laptop repair, PC maintenance, networking solutions, and several other IT enabled services. Online services are exclusively advantageous for small businesses which cannot afford to hire a full fledged IT department.

Online support resolves all types of PC problems including most critical problems too, which may be Operating System Support, Internet Setup Support, Virus Removal Support, PC Security Support, Software Support, Computer Optimization support, are just few from the list.

Online technicians resolve all the issues of the customer's PC at their level best and help to satisfy the customer's needs and enhance their goodwill too. Almost all online support providers hire best tech support technicians for the job.

Multiple online service providers are competing in the market with their outstanding services, but it is suggested to conduct some research before choosing any of them.

Online computer support is gaining its share of importance from the popularity by providing secure online remote tech support for our customers, so just sit back and relax as our technicians will solve just about any type of computer problem you may have.

Source: http://goo.gl/0dBuq

Monday, May 16, 2011

Online Remote Support Has Become a New Trend

Life has become very complex and demanding these days, especially in the work front where the newer and better technologies are replacing humans. But the advantage is that it's making work for us much simpler and very fast indeed. Wouldn't you enjoy if your PC gets all the protection and assistance online or through LAN or WAN connection? This is why IT Companies provide online remote support design. For an organization which has multiple computers working together, the online remote support can help them maintain and control all the computers from one place. This service is very cost-effective.

With the online remote support technical support is being provided to the customers who reside in any corner of this world. This is a one time investment which is very cheap if you compare the cost which may incur due to yearly maintenance charges, purchasing various software's and hardware items, etc. With the help of this online remote support companies keep on monitoring the working of the computer and maintain the data in an organized way too. Your PC is in safe hands and you need not worry about any kind of threats or damage which it may experience while you are working.

Everything revolves around "data". It is very important to keep it safe and away from threats. Backups are required all the time and tools to recover them in worst case scenarios. All these functions can be availed through the online remote support service. It takes up all the responsibility pertaining to the proper working of the machine and assures you full support and guarantee of the functionality. With the online remote support many IT companies have gained in popularity and are one of the leading IT solution providing companies. Professional IT personals work under them to achieve great success in building an IT based company which has everything on offer.

You can securely say that the online remote support provided by these companies is the topmost in the market. The effort being put in to build this support system has no limits and never will the client be unhappy with the services. The services range widely and offer marvelous continuous data protection software to the ones who desire the service. The data recovery TX service deals with various techniques and gears with which important data can be retrieved after being lost. There is no reason why you will not opt for the online support service as it is very beneficial in the long-run.

Source: http://goo.gl/6yqCI

Monday, May 9, 2011

What is a firewall ?


A firewall protects networked computers from intentional hostile intrusion that could compromise confidentiality or result in data corruption or denial of service. It may be a hardware device (see Figure 1) or a software program (see Figure 2) running on a secure host computer. In either case, it must have at least two network interfaces, one for the network it is intended to protect, and one for the network it is exposed to.

A firewall sits at the junction point or gateway between the two networks, usually a private network and a public network such as the Internet. The earliest firewalls were simply routers. The term firewall comes from the fact that by segmenting a network into different physical subnetworks, they limited the damage that could spread from one subnet to another just like firedoors or firewalls. Hardware firewall providing protection to a Local Network.

source: http://bit.ly/kpaZD6