I'd do a clientconnect or clientputinserver search. I already saw that most function names remain the same compared to the 'old' sdk. I think that is on purpose to make the 'shift' as painless as possible.
i already found pieces in player.cpp with FAKECLIENT, even a "IsBot()" function. I think thats pretty neat! They already think ahead on this one.
I found several files with these key words btw, search for it
