On Fri, 11 Mar 2016, Sven Schreiber wrote:
 Am 10.03.2016 um 23:51 schrieb Allin Cottrell:
> Here's an update on the status of clicking on a link to the (PDF) User's
> Guide in the GUI help text. The precise effect depends on the platform
> and the PDF viewer. There are two questions:
> 
> Windows:
> 
> Adobe Acrobat/Acrobat Reader: Yes on 1, and also Yes on updating the
> viewing position now that I've added some DDE code (in git and snapshots).
 Very nice! (haven't tested yet, though)
> 
> other viewers: I'm not aware of any others that will cooperate.
 SumatraPDF seems to do some of it:
 
https://github.com/sumatrapdfreader/sumatrapdf/wiki/Command-line-arguments
 e.g.:
 -named-dest <destination-name>
 "Combine with -reuse-instance if the document is already open"
 -page <pageNo> 
Thanks, that sounds promising.
Also thanks to Berend for the suggestion of looking at Skim and 
TeXShop on the Mac.
Allin