[Zope] Viewing versions and logging out?

I know the answers exist to both of these questions, but I can't remember where I saw them. Viewing Versions: There is a way to give someone a URL that lets them see into a version you have created. What is it? Once they've done that, is there another URL that will disable the version? Logging out: There is a snippet of code that logs someone out (posted to zope@zope.org just in the last few days perhaps? Searching my inbox came up empty). What was that again? Thanks, sorry to ask questions which I know I've already bumped into the answer already.... I would have thought searches for "logoff", "logout", or "go" (I seem to remember that the URL for the version had that in it....) on www.zope.org would have come up with something....