Weapons on creeps etc.?

Howdy, i've played a fair few maps, mostly RPGs, that, when you pick up a weapon item, cause it to display on the unit. I think they're called "attachments" or something. Anyway, i'm just curious as to how to do it? Could use it in a map i'm working on atm.

Thanks.

Attachment Points: overhead,head, chest, origin hand, foot... etz
with aither an aura or a action you could do this...


Good link given by The_Icon check there!