I'm writing a utility which is invoked on a Solaris box, by a dtksh
script (which I can't modify).

The dtksh script includes the two lines:
  XtInitialize TOPLEVEL printerConfig Dtlp "${@:-}"
  XtDisplay DISPLAY $TOPLEVEL

after which $DISPLAY has been set to 0xd9158
Our man pages inform me that XtDisplay returns the display pointer for
the specified widget, but that's the limit of my knowledge. They seem
to be standard lines from the dtksh examples, so presumably these
aren't as destructive as they look at first sight.

Is there anyway I can retrieve the original value of $DISPLAY, and
open new windows?

-- 
Tommy Wareing
Oxford English Dictionary

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