XVPEN UPDATE

I also used XView to write Xvpen, a graphics filter that displays SEP's vplot graphics on an X Windows screen. In IPE and in Figure 2, Xvpen is the natural final step in the processing sequence. In my paper, I pointed out that one drawback to the IPE/Xvpen combination was that it was slightly cumbersome. Each iteration of IPE generated a separate Xvpen window, and the user had to manually remove a window that was no longer needed. I expressed the hope that one day I would be able to simply re-use a window already on the screen. That has now been accomplished, and as a result both IPE and Xvpanel should be easier to use.