Ulrike Fischer wrote:
use pdfclose --helpIt will tell you how to setup a DDE-name. They change every year. I have currently AcroviewR20
Thank you Ulrike — in fact, I had just done that, but I learned as a side-effect that "only documents opened by `pdfopen' can be closed by `pdfclose'", which is something of a bummer in that almost all of my PDFs will have been opened either by the (x)dvipdfm(x) back-end of XeTeX, or by TeXworks ...
-- /Philip Taylor/