That was it. I changed the ID and I was able to run two side by side.  I need 
to remember to change the ID when I revise and compile a new iteration.

thank you Chris and Daniel for helping me out.
John M. Siino

      From: Chris Vine <>
 Sent: Thursday, May 17, 2018 2:39 AM
 Subject: Re: can't run multiple gtkmm programs in Window 7
On Thu, 17 May 2018 07:37:15 +0000 (UTC)
John Siino <> wrote:
> I can't run multiple gtkmm programs in Window 7.  If I try to run different
> compiled gtkmm gcc compile exe files, only the first one runs.  A second
> exe won't start.
> John
If these are programs that you have written yourself, perhaps you are
passing the same application id for each to Gtk::Application.
Application id's must normally be unique.
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