During play, press ~ to display the console window. Enter giftfrompterodon to enable cheat modem then enter thwe following:

chtheal
Restore health

chthealteam
Restore team health

chtweap (0-30)
Weapon select

chtammo
Ammo refill

chtgrenades
Get grenade

cht3pv (0-1)
Toggle third person view

showfps (0-1)
Toggle framerate display

showprof (0-1)
Toggle stat display