ok, select your main movie-cip and press Ctrl+I and give it an instance name say "first".
Now, edit your main movie-clip and drag in the second one. Do the same as above but call this one say "second".
Now from anywhere within the movie, and from any other mc use the tell target action using the following taget:
F4
_level0/first/second
F5
_root.first.second
If you still don't get it I suggest you read the very descriptive Help files which do actually come with flash (believe it or not). ;-)
dave dave@davdesign.co.uk
^^^^^^^^^^^^^^^^