-This trick duplicates any item that can be "stacked" in the inventory. One of the best uses is to duplicate gems to create an infinite source of gold. Place a potion of healing in one of the quick items slots. Open the inventory screen, replace it with a gem, then quickly return to the game screen. The image of the potion should still be in that slot, but the gem's name should appear on the help scroll if the pointer is left over that slot. Left click on the gem once, wait for the target cursor to disappear from your character, then left click the gem a second time. After the target cursor disappears again, return to the inventory screen. The number of gems in that slot should now be 65352 instead of 1. Do not stack any additional gems in that slot, or the CPU will reset the total to 20. Note - This trick works with the original release of the game and may not function in patched versions.
-Have a character get the item you want to be duplicate, then save the character that has the item. Make multi-player game with no one else, just your own computer. Select the first character slot and import the character that you made. Fill the character slots with that character. Make all those characters give that item to the first person. Save the character who has all the items.