Before "collapsing windows" were a part of Mac's appearance options in Mac OS 7.5, there was WindowShade. The author says it well in the accompanying about document:
WindowShade is a unique window enhancement utility for the Macintosh. WindowShade gets its name from the old window blinds that roll up when given a sturdy pull. This utility brings the same functionality to Macintosh windows.
By placing the control panel in the System Folder, your windows are given a brand new feature. By double clicking anywhere on the title bar of a window, the lower part of the window will "roll up" underneath the title bar. Double clicking on the title bar again will lower the window to its original size.
This was one of those little features that just made Mac the better personal computer.Compatibility