One Swf Controls Another

Is there a way for a .swf file to control another, entirely independent swf file?

For example, most of the page will be in html and cold fusion, but there will be a small window dedicated to displaying flash content in one corner of the page.

I want to include another .swf file in the opposite corner that serves as a volume control slider, controlling the volume of the flash content in the opposite corner.

These will be loaded as two separate .swf files, so they don’t share any timelines, etc.

Is there a way for the volume slider .swf to control the flash content .swf? I’m not sure how to reference levels or objects in an entirely separate file.