DPS - how to use it?

[Thomas J Cozzolino]

We've got Display Postscript on our system (the standard libaries and
example programs distributed w/AIX).  My question is, how can I use it?

The dpsexec program seems to be able to accept PostScript input and display
it, but how do I display an existing PS file?  I tried
    dpsexec < file.ps
but that displays the PS file, and then quits and deletes my X-Windows
containing the image.

It seems to shame not to use existing code.  Any ideas?  Please respond to
RBNTJC at ROHVM1 (Bitnet) or rbntjc at rohmhaas.com (InterNet).  Thanks.