To get 2 weapons at once without being a barbarian, all you have to do is:

1.) Look at the 1 and 2 slots on your Inventory screen.
2.) Put one item you want to use in the slot farthest to the left in the 1 slot.
3.) Take the other item, switch to the 2 slot, then bring it over to the slot farthest to the right but don't drop it in.
4.) Press W and right after (like a split-second) click the slot to put the item in.

That's all you have to do! It only shows one weapon,but it adds the mods together. DON'T TRY THIS ON A BARBARIAN! IT DELETES THE ITEMS!

Note: These cheats will not work with the new D2: LoD patch (version 1.09) that has been recently released by Blizzard.