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Many companies want to sell you “memory optimizers,” often as part of “PC optimization” programs. These programs are worse than useless — not only will they not speed up your computer, they’ll slow it down.

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The reality is that password database compromises are a concern. However, if you use unique passwords everywhere, you shouldn’t need to worry too much.

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Many email servers refuse to accept email attachments over 10MB in size. While attachment sizes haven’t kept up with the times, there are other easy ways to send someone large files over email.

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VirtualBox is packed with features that you may have never used, even if you frequently use it to run virtual machines. VMware keeps many of its best features to its paid versions, but all of VirtualBox’s features are completely free.

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Virtual machines generally run guest operating systems and their programs in a single window. However, both VirtualBox and VMware have features that allow you to free virtualized programs from their prison, running them on your host desktop.

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Blocking a phone number from calling you should be fairly simple in 2013, but it still isn’t. Android doesn’t have a completely integrated blocking solution, and carriers don’t generally offer this basic service for free.

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Android’s Daydream feature is an “interactive screensaver mode” that can activate automatically when your device is docked or charging, keeping your screen on and displaying information. Daydream mode can give your device an always-on information display.

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Google Voice has been out for years, but many people in the US still haven’t given it a try. Google Voice offers many features you can’t get elsewhere, and almost all of them are free.

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You’re sitting at your PC and you receive a text message, so you pick up your phone, unlock it, read the message on the small screen, and type one back using the touchscreen keyboard. Why not use your PC instead?

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Google’s Chromecast allows you to send anything you can view in a Chrome browser tab to your PC. You’re not limited to just web pages, as Chrome can play local videos and music files and display PDFs and Office documents.

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Linux users often want to run Windows software on Linux, but Windows users may want to run Linux software, too. Whether you’re looking for a better development environment or powerful command-line tools, you can run Linux software without leaving Windows.

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Tasker for Android allows you to automate almost anything you can think of on your phone. It’s even popular on Android in spite of only having a paid version, which shows just how powerful it is.

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Traditional mechanical disk drives need to be defragmented for optimum performance, although Windows now does a good job of doing this automatically. Some software companies claim that their tools can “optimize” SSDs, just as disk defragmenters could speed up mechanical drives.

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There are a million and one remote tech support options out there. We’ll look at the best ones here, whether you need to walk them through downloading one over the phone or want to set up remote access ahead of time.

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Google’s Chrome OS includes a shell environment known as Chrome Shell, or “crosh” for short. Crosh includes several terminal commands that can be used on all Chromebooks, even if developer mode isn’t enabled.

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We recently covered how to let people use your computer without giving them access to all your stuff using your operating system’s guest mode feature. A faster alternative would be to give them their own, isolated web browser.

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Sure, your smartphone’s camera can be used for photos and video chats, but it can do much more than that. Your phone’s camera is a powerful tool you can use for everything from finding better prices to navigation and translation.

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Tethering is the act of sharing your phone’s mobile data connection with another device — such as your laptop or tablet — connecting it to the Internet through your phone’s data connection. There are several ways to tether on Android.

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Whether you want to store sensitive data on a USB drive, securely email it, or just add an additional layer of security on your hard drive, there are a variety of ways to protect your files with a password.

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Thanks to a new native Android tool, you can now easily locate your phone and (in a worst case scenario) perform a remote data wipe. Read on as we show you how to activate the feature on your phone.

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PCs are all about backwards compatibility, but this can lead to problems. Games designed for DOS or even just earlier versions of Windows may not work properly on modern versions of Windows without some tweaking.

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Tablets are great devices to leave on a coffee table and share, but they’re intensely personal. They provide direct access to your email, signed-in apps, and even your Chrome browser history from your PC.

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Whether you’re trying to get the dust off your monitor or your kid’s fingerprints off your gorgeous new HDTV set, removing dust, dirt, and oil from the plethora of screens around you requires the right tools and the right touch. Read on as we show you how to safely clean your expensive screens.

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If you let someone use your computer, they could gain access to your saved passwords, read your email, access all your files, and more. Instead of looking over their shoulder, just use your operating system’s guest account feature.

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Whether you’re building your own computer, installing new RAM, or upgrading your PC’s components, you’ll be opening it up and touching sensitive electronics components. While doing this, you should be careful of static electricity, which can harm your computer.

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