Global Javascript across pages

I'm sure this has been asked (maybe even by me) but...
Are there global javascript vars that can be accessed across pages? Like a asp session variable but in javascript?
thanks in advance
Michael

The only way to obtain this functionality with javascript, is to use session (non cached) cookies to store any data you want passing to another page!

Or

have a hidden frame that contains your javascript program.
open new pages in the main frame and access functions and vars from the hidden frame!

;)