> but the parent bar can have any position, correct?

Yes.
>
> can the parent bar extend horizontally while the locked bar
extends vertically?

Yes.  Basically, the moving algorithm would only looking at the top-
left corner of the dependent bar relative to the "anchor point"
specified on the parent bar. 

> >
>
> If Bar3 is locked and I move bar1 then Bar3 moves, correct?

If Bar1 is the parent then yes, as long as Bar 3 has been assigned
the PowerPro bar position of locked or floating.  The difference is
that a floating bar can still be moved by click-drag; a locked bar
would only move when its parent did.
>
> > But on thinking about it, I suppose I could interpret a loop as
> > saying either bar is the master, >
> Sounds good to me.

A challenge with this is that you would have to specify the relative
positions in two different ways, one way of bar a (top-left)
relative to (parent) bar b anchor, and then the other way of bar b
(top-left) relative to (parent) bar a anchor.  But both ways would
have to result in the same relative positioning.  So you would have
to do a bit of work if you wanted either bar to control the other. 
I cannot think of any other reasonable way to do this, where
reasonable means not too much work for me and not too much work for
the user.  But I am open to suggestions.



>






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