Multiplayer? PSP vs PSP? PSP vs PC? Adhoc?
Multiplayer will be supported someday. I cannot say when. Don’t ask for it. The first multiplayer release will only support PSP vs PSP over infrastructure mode. So you need a Quake 2 Server running on a psp. No homebrewer knews how to use adhoc wlan at the moment, but it will be added as soon as possible.