The Path Handler product lets you handle URLs which don't correspond to objects.
For example, if ph is a Path Handler, then, in the following URL:
ph
http://a.server/ph/1/2/3/4
1, 2, 3 and 4 don't have to be Zope objects, and the /1/2/3/4 part of the URL will be handled by the method specified in the Path Handler.
/1/2/3/4