So I managed to do this a few months ago, but it was so difficult to find the program that now I can't remember what I used xD
So the goal is to use my laptop as a second screen for my PC over WiFi. The program I used was actually new and seamless. So all I had to do was install the program on my desktop and my laptop, that's it. Non of the faking a second monitor stuff.
Anyone know of the program? I think it may have to be paid for, but that isn't an issue ;)
Is this a sceond screen or just controlling over the network? TightVNC is a better alternative to Splashtop, otherwise I don't know of a program that can make another screen elsewhere.
I've done this before using teamviewer, somehow tricked windows into thinking there was an extra display then viewed that display with teamviewer from a laptop.
You could use Synergy to control your Laptop with the mouse and keyboard of your other pc. Technically not a second desktop, but should work okay for browsing and stuff, also supports drag and drop.