There is no 2 player mode for the PC, but there is Multi Theft Auto and San Andreas Multi Player. But the other person needs to have Grand Theft Auto aswell.
Simply go to the user files folder and create a folder called User Tracks. Copy mp3s into there.Then start the game.Go to the options then audio setup and then user track options.Just scan the user...
Its too much to explain here. Go to wikipeadia and search GTA San Sndreas. They will give you the info on how long the game was in production, what kind of gaming engine they used, lawsuits during...