PSP Bios Question

Sorry if this is silly, I googled around and didn't find an obvious
answer, but feel free to flame me anyway.

Whats the deal with the BIOS updates? Is it true that they are on the
PSP games? Do they automatically install if you launch the game with
the update on it? Is there a list somewhere of which games will update
your BIOS and to which version? Are these bios updates in movies?

Once again, possibly stupid questions and I apologize in advance. I'm
really having a lot of fun with some of the emulators and would hate to
lose my ability to play Bruce Lee on the C=64 for a PSP game that in
all probability, won't be as good.

= numsix