>We have an app with no user interfaces that runs periodically and generates PDF's using Win2pdf and emails the PDF's
>One of the steps involves issuing a report form to print command with the printer set to a postscript printer that creates a postscript file.
>Each time that command executes, it flashes the printer screen momentarily.
>I'd like to be able to inhibit that flash.
>Any suggestions?

In addition, you may try to use LockWindowUpdate API.