In this article Robby Ingebretsen is talking about deep linking and browser history navigation in Silverlight :
"Deep linking is a strange term and the first time I heard it was while I was giving a talk. Someone asked me if Silverlight supported deep linking and I sort stumbled around until I found my way to a big “I don’t know.” Well, now I do and the answer is, um, kind of. Technically, it’s a no, but, as with most things, there is always a way. Last week I spent a couple of evenings trying to track one down."