How to control external loaded movie?

I have a main swf and inside that swf i have loaded a external swf with a video.
Now i want to control the swf with the video but from buttons located on the main swf…
how can i do that? what will be the target to the external movie?

I have loaded this external movie with this command:

//load Movie Behavior
if( == Number({
} else {"video.swf");
//End Behavior