I'm working on a little prog with a draggable trailing thing:

onClipEvent (enterFrame) {
if (themouseDown == "TRUE") {
i++;
newMOV = "drag"+i;
oldX = _root.drag._x;
=====>>duplicateMovieClip ("BLUE", newmov+i, i);
setProperty (newmov, _x, oldX);
}
}

For example, this bit of code is attached to a movieclip instance called RED.
If my target for duplicatemovieclip is an instance other than red, it doesn't trail. If I put "RED" or "FOO" or _any_ text into the target name, it trails.
a) why?
b) can I get RED to trail (make duplicates of) BLUE or can an instance only make duplicates of itself?

thanks to all