I can think of way too many times where an app like this could have come in handy; when I'm on my work computer but stored some important documents on my home laptop... when I was in school but left my homework in my home laptop... basically, whenever I'm careless.
Getscreen is an application that allows you to have remote access (i.e. from a distance) to any desktop (that you have permission for... obviously), from anywhere in the world.
The idea behind an app like this is that regardless of where you are, if you don't have immediate physical access to your computer, an app like Getscreen would let you access your machine remotely-- whether that's from a phone, a tablet, or another computer altogether.
You create a link, or connection of sorts, i.e. I download Getscreen on my main machine (my laptop, in this case), and only people with a specific URL will be able to access it remotely.
If you need a bit more reassurance before actually downloading this, you can check out their demo page to see it in action.