2 controllers on PPSSPP

[that anon]

So this is what im trying to do:

I have two ppsspps set up (multiple windows), and i want to play multiplayer with my friends on one pc.

I have no problem with networking, its just that whenever i try and play one of the ppsspps, the controller inputs into both ppsspps.

Ive only actually tried it with one controller and not two yet, but is there a way to make one controller input into one window? Or will the problem be resolved when i actually use two controllers