Type on your keyboard: "Dmstuff" to get all the weapons and inventory items. And Type: "Dmhollycorn" For god mode. That's all I know for Duke Nukem 3D. Duke Nukem Rocks!
On default settings it would be your jump button or "A" key. Going down would be your crouch button or "Z" key.
it will if you use compatibility mode
duchess.
PC stands for personal computer.