[Zope] How do you use acquisition when instantiating an object via a REQUEST.set

I am a relatively new Zope user and I have a simple python Class in a python product such as: class Item(Acquisition.Implicit): # Just a simple item class def __init__(self, id): self.id=id If I instantiate the object in DTML with somthing like this: <dtml-call "REQUEST.set('item',Item.Item('someid'))"> How can I make the object acquire the current context? I do not want the object to be added to any container other than the REQUEST. Thanks, Corey