Cheats from Duke Nukem 1?

Question

Can anybody tell what does it mean or how to execute the command line? thanks for help.

Cheats from Duke Nukem 1
Backspace + PgDn: Get all four keys and full firepower for your Nuclear Pistol.

Using asp as a command line parameter (e.g. dn1.exe asp) will enable the following cheats (thanks Frenkel):
G + O + D: Full health and all items
G + O + W: Skip to the next level

Answer 1

Im just guessing because i really dont play computer games, let alone cheat on them, but ill try to help.

For the first one, you need to press both at the same time or press backspace then PageDown.

As for the others, it seems you need to type this into some sort of machine or item. I have no idea what a command line parameter is or dn1.exe asp. Sorry i couldnt of been more help.

You can always look to gamefaqs.com, search for your game, click the cheat codes tab and that should help