YOU MUST HAVE CHEAT ENGINE INSTALLED ON YOUR COMPUTER OR THE HACK WON'T EVER WORK!
For V1.3 the F8 button is the same as F6 but if you respawn with F8 you can go through stuff. It doesn't work all the time so it's 50/50 chance.
For V1.2 it is too glitchy to use but it works. GO DOWNLOAD V1.3
For V1.1 it barely works, so get V1.3 and its kinda useless.
For V1.4 it will feature NameTags/ESP since he told me that on another forum and in the friendly challenge thread from Legify. Coming soon tomorrow (7/26/2009)
For V1.5 and up it will be all private/VIP. So no more public hacks but there is a possibility for a new bypass to kick in and make V1.4 and lower to work again.
EDIT: The bypass cannot be injected by PerX or else it will disconnect. Try to run OMFGZ injector if you have Vista because it works. OMFGZ might not work on Vista PC's. Or just find another injector.
I was told by a expert hacker (nzl123 from another forum) that glitch button is this in C++