Diablo

Duplicating Items:
     Drop any item on the ground and walk back about five spaces. Make
sure  you  have  room in your inventory for two of the items. Click on
the  item  and  right  when  you are picking it up click on any of the
items in your belt (the belt is the area that has 8 spaces for potions
and  scrolls.)  If  you  did it right the box where it names the thing
your  clicker is on should name the thing you are trying to duplicate.
Press  the  hotkey for inventory (I) and put it in your inventory. The
original  item  should  already  be  in your inventory. Make sure your
inventory is closed while duplicating until you put the item in.