To be honest, I don't understand the need for hiding URLs in the first place. I know why some people do it, but it just doesn't make sense to me. --Matthias Gutfeldt
It doesn't make sense at all. It breaks bookmarking, makes navigation idiotic. Usability really nose dives with any attempt to pretend not to be the page it really is. Avoid at all costs -- Isofarro
Actually the concept allows for implementation hiding in programmed web sites and while URLs are not always hidden they are routinely obsfucated and expired by app servers to avoid screwing up if bookmarked. Hiding maybe not, cleaning and protecting access to "soft parts" of a site.