Some Classic Mac OS Finder features explained: Pup-Up Folders: When dragging a Finder window near the bottom edge of the screen, its outline changed (the Class

Some Classic Mac OS Finder features explained: Pup-Up Folders: When dragging a Finder window near the bottom edge of the screen, its outline changed (the Classic Finder just displayed a dotted outline while dragging windows to safe display memory) to represent a tabbed window. If the window was released like this, it would change to a tab aligned to the bottom edge of the desktop just wide enough to represent the window title. Clicking this title tab, the window would pop-up to its full size with scrollbars, the title tab centered on the top and two resize handles at either size of the document bar at the top (the one reporting items and folder size). Clicking on the tab again or anywhere outside of the window would minimize the window to its tab again. When dragged away from the bottom edge, a tabbed window would change back to normal behavior. (As mentioned in the article, this feature eventually was discarded in favor of the Dock.) ([Edit] Notably, pup-up folders deviated from any other window behavior on Macintosh as its location wasn't given by its top left corner, but rather by its center axis, to which it was aligned. In this aspect, it was always a bit of an oddity in Mac OS, and, while exceptionally useful, didn't integrate too well to the rest of the interface. Also mind usability aspects, when changing behavior while dragging and by this also switching respective alignment anchors.) A somewhat similar feature not mentioned in the article were collapsable windows, which collapsed a window to its title bar (either by the special collapse widget at the very right of the title bar or by simply double clicking the title), but which were still freely moveable and stackable on the desktop. (The closest there was on Classic Mac OS to iconizing.) Classic labels: These were limited to a set of 7 labels, either selectable from the menu bar or by an icon's context menu. Each label had an associated color, which would colorize the icon by a translucent tint in icon and list views. (Wording and colors of these labels were globally configurable in the Finder preferences.) Labels were both a visual hint and a useful sorting criterium in the Finder. Proxies: Besides the proxy icon in the title bar of a window or document, there was also another use of proxies, namely in the process menu at the very right of the menu bar. This was a tear down menu listing all active applications, which would transform into a floating pallet window, when rorn from the menu bar. Applications would be listed as buttons (a now forgotten optional window view) with the active application shown in depressed/active state. App-buttons would receive drag-and-drop actions like any other representation of an application. Notably, there was a (somewhat hidden) path view in Finder, namely in the form of drop-down menu appearing on a Cmd-click on a window's title. However, while this could be used for orientation and traversing the hierarchy upwards, this wasn't of use for any sort of pinpoint forward navigation. (The early-Safari snap-back feature in the article's wish list is somewhat related to this.) This is still a feature of Finder windows.