To enable god mode, open the autoexec file in any text editor. Look for
the entry "PlayerTakeDamage" and change the '1' to '0'.
To disable clipping, open the autoexec file in any text editor. Look for
the entry "PlayerClip" and change the '0' to '1'.
To enable god mode for your enemies, open the autoexec file in any text editor. Look for
the entry "AITakeDamage" and change the '1' to '0'.