Full screen flash page

this is gonna sound really basic and OK i hold my hands up in the air, i aint no pro’ but i have done some rather decent flash pages lately and dont want to ruin them this far on . its just that i still cant get my head around this dam problem!
can someone please explain to me the notion of stretching your flash pages to fill a web page completely. i have just read the new post by micheal chen.
and all sounds easy enough . . but, this is where i come into problems . .
do i have to do this to every single flash file that is within my site or, for example do i just need to do it to the main splash page if everything were to open within this?