Thanks pjz99!  O.K. I'll be sure to Minimize it.  Can I just keep it Minimized?

This reminds me there is a Task Manger Function to give Poser a Higher Priority; but any time of tried this, in a similar situation, I've lost control of windows.  THe render may have gone far, but it was useles, becuase I could'nt save it, before Windows crashed.