First, create a text file named "command.txt" using the Windows NotePad and put it in your Hellfire directory.
Next, place the following lines in command.txt:
multitest cowquest theoquest bardtest barbariantest
This enables the Bard character class, two new quests, and LAN/Modem games (without needing the patch).
BARDTEST: Gives you a Bard character. Looks like the Rouge but can use 2 One Handed weapons at the same time.
THEOQUEST: A little girl should appear in the village. If you complete her quest, she'll give you some treasure.
COWQUEST: The farmer in the village will be replaced by a cow. Complete his quest, and he will give you the "Bovine Armor".
BARBARIANTEST: Gives Barbarian class. He has no magical abilities but can wield two handed weapons in one hand.