I don't know many ways to remotely control another computer from yours, nor do I fully understand how some ways works, but a pretty simple one is to install TeamViewer on both machines and voila.
You don't need to create an account, you simply need the ID of the PC you want to control, assigned by the program (it shows up right after installation) and the password (also assigned, but can be changed). It's a 5 minute thing, if that much. So go ahead and have fun messing with other's computers by installing this without them knowing. If they're complete n00bs (like you, probably) they'll have no clue of what's going on.
On another note, today a friend of mine had trouble turning on his laptop, so to help him I did what I always do, I googled the problem. This doesn't always work but the first thing you should try is to disconnect the power cord and the battery and hit the ON button a few times (but not like 4 or 5, keep pressing that button repeatedly for a bit). Now wait about 2 min and don't do anything. This will completely discharge the capacitors, or something. You may now reconnect the power cord and/or the battery, and for some reason your machine will turn on now, probably. If it doesn't then you have to get real geeky and open your laptop to check if the RAM isn't moved. From that point on I don't recommend my potencially n00b-ish readers to try anything else, just take it to get it fixed.
That's all I have for today, haven't been much into this lately... will try to change that ASAP