DragWindow INIT

DragWindow INIT is an extension for classic Mac OS that was created in 1990 by Ricardo Batista.

Functionality
When installed, the extension causes the Finder (and all other applications compatible with System 6 and later) to display the full contents of a window in real-time when dragged. The  routine of earlier versions of classic Mac OS would only display a dotted outline during drags, due to the limited speed of early 68k processors. This functionality did not become a standard feature of the Macintosh until Mac OS X.