Some questions about normal => fullscreen stageDisplay (AS3)

Ive only recently discovered this function as newb as i am and had some questions in regards with it (AS3):

how do i align the pages content when i go fullscreen?
how do i retain the scale of my content?
is it legal to auto set fullscreen when the swf loads on a webpage, say for presentation purposes?
and is it possible to set up triggers to change the content of the page when going into and out of fullscreen e.g. play a movieclip animation etc… ?