Logitech Flow allows you to use a single input device, be it a mouse or keyboard, on multiple computers over WiFi. It is not a daunting task as the app has a simple UI that one can get accustomed to ...
I have a cheap Logitech laser mouse (not wireless) I bought at Wal-Mart. It works fine in normal use, but the cursor turns invisible in games. Most recently in Dragon Age. You can sort of use it in ...