The code that did the work was a simple WDEF whose structure region was taken from the main screen's bounds and whose draw method filled in the extra space with a color or pattern. Director itself was completely oblivious to the change, it just saw a window with a very, very thick border. Most of the development work was actually in the installer application, which added the functionality to the standalone playback 'projector' with a simple drag-and-drop, and in the XObject that provided runtime control of the border.

I revised FinderHider a couple of times in response to customer requests, adding support for non-rectangular borders, transparency in the stage itself, and for use in HyperCard and Authorware titles.