You can share data via tables or the registry between the two instances 
but you can't share global variables in libraries because the libraries 
are only "global" within each instance. If you're talking about having 
one instance send an event to another instance, you can't do that (not 
that I know of). I've overcome this limitation by having a timer in my 
startup form that checks a table every, say, 5 seconds, and picks up 
instructions from the table to perform certain tasks. The instructions 
are written by Paradox instances when something needs to be started or 
done in another instance.

Peter wrote:
> I have two instances of Paradox, ie, they have different private
> directories.
>
> Is it possible for one instance to open a form and/or send commands to
> or otherwise communicate with the other instance?
>
> Thank you for any help.
>
>
> Peter