PCI
Procedure >> Online game with PSP >> Activate game
Activate game
 
Activate "PSP" game
Insert the game title to UMD slot of PSP.
It should be playable title with ad hoc mode.
Some of the titles might not work.
Select ad hoc mode play

It will depend on the title, but「make game room」、「Join the game」,「Join the race」or「meeting place」are ad hoc play.
※ Playstation® and PSP™ are registered name by Sony Computer Entertainment.