how i can change my name when i am playing mw2?

hi.
anyone can help me?
how i can change my name when i am playing the game?
is that possible?

L2mod.. seriously

/moved to help

seriosly-.-
liberation 1.06 do it -.- just open the mw2_liberation file (not the application) and go down and name spoofer : 1 then the name down there
(in name is actually mw2_liberation_user)