You require a wireless connection which has internet access, or use ad-hoc with other psp's. This is game dependent, and some games require you to register and use their service (free of charge) while other just allow you to find someone to play with.
Case b) you join a game session with other people, like in Burnout Legends.
you go into the games folder and go into the savedata folder and press x on what game you want
Connect to the PSN from the GO's menu. You can access the store, where you can purchase and download GTA IV, if it is available that is.
Put the game disc into the PS3 that is connected to the internet and signed into the Playstation Network of couse
Go to the Game Sharing and then wait
Niether you can play it online nor free because it would be a copyright violation to put it online.
Yes, you need to pay to play online on play station 4 Examples GTA Online The Crew
If you alredy have PS3 online account, just go to multiplayer, then press online.
online yes offline no
Only the same game plays each other so there are maps on his that you can not play, but others that are the same game
Yes. But you can't play with people that have Liberty City Stories if you have the original GTA 4 disc
ok wat games do u play? if u play gta 4 the add me: bowlofchips