Copy both "Curtain From....vsm" and "LandruCurtain 1.0.vso" into your Plug-Ins folder.
Add "Curtain From..." to your favorite WorkSpace.  (Do NOT add "LandruCurtain 1.0" to any palettes.)

Draw a line or an arc where you'd like your curtain to appear.  ("Curtain From..." will only work on lines and/or arcs.)

With that object selected, click "Curtain From..." from your menu.

If a dialog box appears, click "OK."

A "LandruCurtain 1.0" PIO will replace the ovject you selected.