The good old way to enter codes for immortality and so on, for this you need to enter this in the “config” file at the very end:
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seta thereisacow “1337”
bind F1 “god”
bind F2 “give ammo”
bind F3 “notarget”
bind F4 “noclip”
bind F5 “jump_height 100”
bind F6 “timescale 0.5”
bind F7 “timescale 1”