[Zope] SiteRule

Greetings, 1) How can I use SiteRules to redirect a page access? Scenario /download SiteRule LocalFSObject getInfo - DMTL doc A user goes to LocalFSObject and the SiteRule will check REQUEST for something, if it is present it will allow access of LocalFSOBject otherwise send the user to getInfo.... Is this possible and is there a URL to some example code? 2) It seems to me that SiteRules are some magic outside of influencing the page that was actually called in the SiteRule's folder. For instance, text is not returned to the page (which is expected as a pre-process rule), but much to my chagrin I cannot set Session variables, which would be a totally logical place to do so. Why is this? Thanks very much, Paz