reuse open pdf viewer

[Neal Becker]

When I use evince, each view re-uses the existing evince viewer instance.

I'm experimenting with pympress, which seems really nice for beamer
presentation.  Each time I view the pdf, a new pympress window is created.
How is it arranged that evince will reuse the existing window, and how
might I convince pympress to do the same?

Thanks
Neal

-- 
*Those who don't understand recursion are doomed to repeat it*
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