If you've ever been called on to do tech support, either for work or as the family's resident tech expert, you know how handy a decent screen sharing tool can be. Google Duo has been around for a while as a video calling tool but Google has added the ability to share your screen during a call. That should make life easier for tech support and people wanting to do product demos and presentations over Duo.

When you're sharing your screen for a business or school presentation, you don't want any notifications popping up, like a sext, a calendar notification for your therapist appointment, or a Slack DM about the problem client you're currently presenting to. You could hit "Do Not Disturb", but what if you forget? While Windows 10 has a built-in option to turn notifications off during screen-shares, OS X doesn't. The free app Muzzle fixes that.

Android/Windows/macOS/Linux: There are a lot of awesome ways to access the files and apps on your Android phone from your PC. DeskDock takes it a step further by simply treating your Android device like it's connected directly to your computer.

Screen sharing on a Mac simply involves selecting the Mac you want to share in Finder, clicking Screen Share, then logging in. If you're looking for an even faster method, Macworld shows you how.

Chrome: Sharing your desktop is a simple process. However, if you would prefer to just share access to your Terminal, Nutty is a simple Chrome extension that does just that.

Windows/Mac: There are nearly as many screen-sharing applications as there are people on Earth. However, sometimes you need something simple so you can fix your aunt's computer remotely. Deskhop simplifies this process by tapping into your Facebook connections.

Google has added a new remote desktop feature to Hangouts. This means you can video chat, troubleshoot and control a friend's computer right in the same window.

Windows/Mac: Screen-sharing applications are a dime a dozen these days. Screenhero differs from the rest by letting both users control the screen with their own cursors and keyboard at the same time.

Mac/iOS: It's easy to share your computer's screen from anywhere, but when it comes to your iPhone or iPad, that's not always the case. Fortunately, a clever method discovered by entrepreneur Matt Galligan offers a simple solution.

Chrome: Previously mentioned screen-sharing service Screenleap made waves because it allows you to share screens with someone else with a single-click, no plug-ins or client installs required. Now, thanks to the new Screenleap Chrome Extension, you can launch screen-sharing sessions from inside Gmail, using your Google Contacts.

Your home computer is the perfect machine. It's customised to your exact needs, runs all your must-have apps and holds every important file you'd ever need to access. The catch: it's not exactly practical to lug a computer with you everywhere you go. That's where remote access comes in. Here are three simple ways to control your home computer from anywhere -- your laptop, phone, or even a friend's computer -- as though you were sitting directly in front of it.

There are plenty of free web services that allow you to easily share your desktop with others, but new webapp Screenleap simplifies screen sharing even further. Screenleap allows you to share your desktop with as many people as you choose, without signing up for an account, downloading and installing anything, and does it all for free.

If you're looking for a way to share a website or collaborate over a web page with a friend but you don't want to install anything to do it, Channel.me can help. The service offers simultaneous browser sharing, real-time chat, and the ability to add notes and comments right on the page.

Mac OS X: Skype Premium subscribers can now use screen sharing in group video calls with Skype 5.2 on Mac.

When Leopard was released, one of the most enticing new features was Back to My Mac, a tool that made it possible to access your home computer remotely—including remote control of your desktop and access to your files—no matter where you are. The catch: It requires a $100 yearly subscription to the lackluster .Mac service. Right now I'm working from my laptop in Austin, and I've got the same full access to my home PC in Los Angeles as Back to My Mac offers, but I didn't spend a dime on .Mac to get it. That's because all of the tools you need to roll your own Back to My Mac are already built into Leopard for free out of the box—you just need to know how to access them.