What you do is if you have a gameshare compatible game (ie: Burnout). You go to multiplayer on the game, and then you hit gamesharing on the game, and then the other person with out the game hits gamesharing. Then it will load and you can play with one umd.

what games have that??? does wipeout??

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what i mean is how do we use the one in the GAME menu because i got two multiplayer games which are Ghost In The Shell and Need For Speed Rivals

You need to have a Gameshre-compatable gam like Namco Musum Collection, Burnout, or Fired up (there might be other games, But that's all I know). When you have the game inserted, you start the game. IN THE _GAME_ you go to wherever the gameshare option is. Your friend or whoever you share it with goes to the PSP menu and selects gameshare. You send the game to him/her over wifi and they play it.

And Wipeout does not have it.

so with any game with that option all you need is one UMD and 2 psps?

Yes, that is all you need.

I was reading about ds homebrew, and there's a hack where you use some custom drivers for a wireless network on your computer to send homebrew programs to the ds and the ds picks them up and play them with it's download play/gameshare function. Obviously this wouldn't work on a psp because of the encryption, but could you send something that is signed by sony, like the burnout demo, to your psp? Could the game share part of an iso be taken out and sent wirelessly to a psp? Because it's unedited the encryption should be intact and the demo will play and stay in the ram until the psp is turned off. I've searched for this and seen only people asking if homebrew could be run from gameshare, not if burnout demo's could be.