Edit: Thought I might post a link to the LiveDocs for
fscommand since people on the forums keep getting confused about
this pretty much undocumented function in AS3. I'm sure it is
simply because the Flash team is intending to deprecate it
completely but either way, it is still there and it's use is no
different that it was in AS2. The only difference is that now you
MUST import the flash.system package to use it.