With this app you will be able to use your Android device as Mouse, touchpad and keyboard for your computer by connecting your device with either Wi-fi or Bluetooth.

You also need the host program for the computer. This can be downloaded from:
http://www.backenhof.se/projects/pointer/Pointer_Host.zip

If you are unsure of this purchase I recommend trying the free version called 'Pointer'. It is a lite version without multitouch and bluetooth.