an emulator on a psp? possible?

[ninjadude]

i have a friends whos trying to put emulators on his psp, but he cant figure out what to do.
so what i want to know is it possible?
and if its possible
what emulater to use?
how should he install it on his psp?

[mhl12]

take a look here: http://www.emulator-zone.com/doc.php/psp/