[Zope] off-topic: does caching work differently with frames?

Hi, All I'm working on a new site that uses frames for navigation (or, at least for one mode of navigation). I know other people have complained about caching issues on this list before, but I'm not sure if I've seen this before: when I'm using frames, IE5 seems to just put up the cached copies of things. If I go directly to the URL at the top level, I see the new content... but I have to explicitly refresh in the frame in order to get the new content to show up there... Is this consistent with what you've all seen? Is there a way to make this stop? Thanks, Kevin