i've managed to work out how to enter the cheats that r listed somewhere on this site ...u press T and type them in the talk box... shame there's no god mode cheat that i can find yet - but unlimited ammo is a good thing hehe
hope this helps

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-WindowsXP (SP1)
-AMD Athlon XP2400+
-512MB DDR333 (PC2700)
-GeForce4 Ti4600 128MB
-Seagate 80GB 7200rpm HDD
-SoundBlaster Live!
-Creative Inspire 5.1 5400