Save SWF session

Please help me I need to know if its possible to save flash window session? I’m making flash video game where I need savegame feature and I want users to be able to stop playing single player mission and to log out from the site, then sometimes in the future when they decide to continue to be able to log in again and continue playing. I was wondering if there is such an option in flash CS3 or 8? I think it should work somehow based on swf file saving, for example when user stop playing I need to export swf movie with current state and store file somewhere on server to be able to call it again sometimes and continue playing movie. Help!