Controlling external swf's

hi hi, i was wonder if that once i have laoded an external sfw then can i controll it, from the main swf?.. eg…

i have a navagation bar an swf , and a flash frame a diff swf (where more external pages are loaded), then i click a button on the navagation i can control stuff in the flash frame?.. sorry for my bad explenation :frowning: lol hope you guys/gals can help

thx in advanced