Monitoring the end of a movie clip

I have a .fla which loads 2 swfs. Each swf plays an animation.I want the 2nd swf to play when the first is finished. What is the best way to monitor the first clip for when it ends (if this is possible). Would the onUnload() handler help?

Can’t you just put code to play the 2nd swf on the last frame of the 1st swf?

:hr: