Flash and browser back button

is it possible to set a marker in your flash movie so that when users hit the back button in their browser it will go to the last part of a flash movie?

It seems to me that if your site is a hybrid (html/flash) then this is possible. If your site is 100% flash is there a way to do it?

also, is there any way to get your 100% flash site search engine optimized/searchable?

i’ve heard talk of a marker frame or something to that effect…