Remote Control Collection is an app that lets you control your computer with any Android device. To do so, you just need to install a specialized software on the computer you want to control remotely.
The free version of Remote Control Collection lets you use your Android device as a mouse and a keyboard. This means you can't see the computer's screen from your Android, but you can still use it to work on your computer.
The PRO version does let you see your screen, and you can also use the device as a remote control to play music and movies.
Remote Control Collection is an interesting app. The main drawback is that you need special software installed on your computer to use it. Besides that, the app offers a good set of features, and a pretty elegant interface.