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Duplicate Items: Go to stairs of any level (except upstairs level 1). Drop the item(s) you want to duplicate near the stairs. Now take the stairs up/down. Then, alt-tab out of the game and go to your Nethack directory (folder). You will see some files like .0, .1, .2, etc that are named after your character in the game. The number at the end stands for what level you are on. Ignore the one with 0 at the end. Now copy the level that you dropped the items on, and put it somewhere outside the /nethack directory. Now go back to the game and go up/down the stairs, pick up your item(s) you wish to duplicate, and go back up/down the stairs once more. Then, put the file of the level with your items back into your /nethack folder. Click 'Yes' to overwrite. Then, go back up/down the stairs and collect your items again. You can repeat this process as many times as you want!
Keep playing after death: In your /nethack folder you should see something like .NetHack-saved-game. These are your save files. To prevent your character from being erased after death, simply copy the file of your character outside of the /nethack directory. The next time you die, you can just copy the save file back into the Nethack folder and play from where you saved last time. Make sure to make a backup of the saved game file each time you finish playing!
Nethack Game Review courtesy of DOSGames.com:
Despite it's name, this game does NOT involve any type of computer "hacking". It's actually my favorite "Roguelike" game. While it may take awhile to learn all of the different commands, the game itself is very deep and involving. Plus, it's different each time you play. Unlike most Roguelikes, Nethack also features optional VGA graphics. (Check 'em out in the screenshot. To learn how to get VGA graphics in Nethack, read our FAQ!) This is one of the few games that I come back to play over and over, so I suggest you try it! (Check nethack.org for special Windows/Linux/WindowsCE/other versions!)