Flv external content

Can I use addchild & cuepoints in a streamed video to

  1. play an external moviclip/swf on top layer with a transparent background?
    (without affecting original timeline & background video playback)

  2. play an external audioclip/mp3/swf that will be “inserted” into original timeline?
    (thus extending original timeline however long the external audioclip is)

>>>I’m new to AS so if I got the command/method wrong tell me which will do the trick, with that I’ll do further research to try and make it work out.

You don’t need to elaborate lines of code or logic, just tell me which commands and brief me.