Switch account without exiting the game?

[tu y tu mama]

I've been Googleing but I can't find an answer, not even someone who asked this.
Anyways, I want to switch from one account to another without exiting the game, just like the Xbox where you can press the home/dashboard button then press X and you'll logged out and you can sign in another account. Well I can't seem to do this on the PS3, I don't know how at least, because I was watching a video and the dude was able to do that but I can't seem to find how.
Anyone knows how to do this?

 

[Deathcrow]

Hmm. I haven't really used my PS3 much. I don't like how things are setup and the navigation of everything. So unfortunately I can't help you much with this. I'm on my phone at the moment, but when I get on my computer I will try to search for the answer.

 

[Stewie]

You can't switch from user accounts on the ps3 while playing but you could hit the PSN button and sign out of PlayStation Network then login to a different psn account. (Pretty much the same thing unless your playing a game that requires data stored on another user account.) This would work for COD though.