[Zope] Programatically working in versions?

Is it possible to programatically work in a Version? Obviously adding a version is pretty easy but how would I start working in one from a Python script or commit the data? ________________________________________________________ Outgrown your current e-mail service? Get a 25MB Inbox, POP3 Access, No Ads and No Taglines with LYCOS MAIL PLUS. http://login.mail.lycos.com/brandPage.shtml?pageId=plus