[Zope] NEWBIE: DTML Appending string and passing in REQUEST?

Hi,, Really simple question that I just cannot figure out. I want to append items together and pass as form item to another method in REQUEST. Well I can create an empty string in REQUEST with <dtml-call "REQUEST.set('list', [])"> I can then iterate and fill the list fine. <dtml-call "list.insert(0, id)"> Then I want the results of the list in one variable in another method. i.e.: I have a list ['item1','item2','last item'] and I want a string like "item1/item2/last item". I know I can iterate through the list with dtml-in but what is the right join syntax? <dtml-call _.string.join(list,' ')> doesn't get me anywere. Thanks for your help Chip