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Stack Internal Stack Overflow for Teams is now called Stack Internal. Bring the best of human thought and AI automation together at your work. Try for free Learn more 3. Stack Internal 4. Bring the best of human thought and AI automation together at your work. Learn more Stack Internal Knowledge at work Bring the best of human thought and AI automation together at your work. Explore Stack Internal Was Windows 1.0's lack of overlapping windows a legal or a technical matter? Ask Question Asked yesterday Modified today Viewed 5k times 22 Windows 1.0 didn't have overlapping windows; it wasn't until Windows 2.0 that overlapping windows were introduced. Obviously, with the small screen resolutions of the day, not having overlapping windows made having multiple windows visible challenging, at best. As someone who didn't touch Windows until v2 and not in any real capacity until 3.1, I only looked back at these older versions many years later. I feel like I read in the past that Windows 1.0 behaved this way because Microsoft was trying to avoid getting into legal issues with Xerox or Apple in the look-and-feel space, but I can't cite a source for that. As suggested in the "Pirates of Silicon Valley" movie (which was based on actual events but with a heavy dose of artistic license), there was a scene which supported the "legal" reasoning to cool down Steve Jobs from taking Bill Gates to court. In particular, not having overlapping windows seemed to suggest it was more of a task switcher versus a competitor to the Macintosh System Software. However, I recently played around with a port of Minesweeper that runs on Windows 1.0 and was surprised to see that it happily popped up over other windows and could be moved around. As such, it looks like overlapping windows were technically possible. So is the reason for Windows 1.0 not having overlapping windows more of a legal thing (i.e. to avoid dispute with Apple), or technical as in the window manager really didn't support it, and perhaps this Minesweeper example was more of a hack? overlapping WineMine on windows 1.04 * windows * windows-1.x Share Improve this question Follow edited yesterday user3840170's user avatar user3840170 28.3k44 gold badges115115 silver badges173173 bronze badges asked yesterday bjb's user avatar bjb 19.5k11 gold badge6363 silver badges172172 bronze badges 8 * 1 If I recall correctly, even the menus that pop up from the menu bar are implemented as separate windows, and those overlap their host windows easily. So the technical capability for having windows overlap was probably always there. But I am not sure if this was already true back in Windows 1.x. user3840170 - user3840170 2026-03-03 20:26:26 +00:00 Commented yesterday * 1 @user3840170 - In conventional windowing-system design, everything on the screen is a window. e.g., a button is a window. This allows for regular treatment of events such as mouseclicks. (X11 has a concept of 'gadgets' that have no window of their own, I am not sure whether MS Windows does). dave - dave 2026-03-03 20:56:28 +00:00 Commented yesterday * 7 @TonyM even in later versions of Windows there wasn't a backing store unless the graphics driver provided one (using spare VRAM). Overlapping windows don't require one; Windows asked programs to redraw newly-exposed areas after window moves (which were handled using outlines, not moving window contents). Stephen Kitt - Stephen Kitt 2026-03-03 21:20:20 +00:00 Commented yesterday * 1 In standard Win16 and Win32 each list box, edit control, caption etc is a window at system level and can have its own window class and message loop. In the contemporary GEM, by contrast, only the desktop and top-level windows are full windows; everything else is an "object" and the containing window or form handles events for them john_e - john_e 2026-03-04 13:20:50 +00:00 Commented 9 hours ago * 2 @Tommy the source code is available -- from a quick look at it, it doesn't do anything special other than setting a "popup" window style. Stephen Kitt - Stephen Kitt 2026-03-04 17:35:46 +00:00 Commented 5 hours ago | Show 3 more comments 2 Answers 2 Sorted by: Reset to default [Highest score (default) ] 18 BetaWiki claims that Unlike any later releases, Windows 1.0 primarily manages windows by tiling them rather by stacking. This was a design choice promoted by former Xerox PARC employees, which was backed by their research done during PARC's Cedar project, rather than a legal or implementation limitation. In fact, Windows 1.0 supports and internally uses overlapping windows, although this ability is limited to popup windows and certain controls such as menus and dropdowns--by default, windows are tiled on top of an overlapping window manager. So it seems that tiling windows was what the Windows developers thought was best, not a technical limitation (as your screenshot demonstrates) or a legal consideration. BetaWiki doesn't provide references for this though. Nathan Lineback's GUI Gallery has a page about Cedar, with screenshots that shouldn't surprise people familiar with Windows 1.0: Screenshot of Cedar, showing tiled applications See also this video of Eric Bier demonstrating Cedar. It's perhaps worth noting that Cedar was designed for systems more powerful than typical PCs when Windows 1.0 was released: Xerox D-Machines had at least 1MiB of RAM, and large displays with resolutions of at least 1024x768, whereas Windows 1.0 could run on a PC with only 256KiB of RAM and CGA graphics (640x200). The high-resolution displays in particular would make a tiling setup more comfortable to work with than a regular PC. Share Improve this answer Follow edited 13 hours ago answered yesterday Stephen Kitt's user avatar Stephen Kitt 141k1919 gold badges583583 silver badges542542 bronze badges 2 * 5 To this day, there are window managers on linux and third party tools for macOS and windows to support this paradigm, and some people continue to advocate it as a better UX, but requiring more effort to learn user1937198 - user1937198 2026-03-04 11:23:02 +00:00 Commented 11 hours ago * 2 And with modern resolutions and Windows 11, I find that I'm often tiling my main applications, while the overlapping windows are file browsers and smaller widgety applications. Theodore - Theodore 2026-03-04 14:36:36 +00:00 Commented 8 hours ago Add a comment | 10 Here are some sources I found: 1989 court case The main legal case is the Apple Computer, Inc. v. Microsoft Corp. 1989, where the change from tiling window management to overlapping was an important aspect. However, this is after the change had already been done, so it may not have been significant in the original decision to use a tiling manager. The court case may have distorted later reporting about the Windows 1 vs. 2 design decisions. Info World 1983 The Info World magazine November 21, 1983 contains a statement by "Steve Bulmer" [[sic]]: But Microsoft has chosen a "tiling" approach to windowing. In a tiling approach, the screen display is divided into columns, and the columns are broken into windows. Windows has a built-in "automatic window layout" feature that resizes all the windows when the size of any one window is altered, so that the windows never overlap. When one window is placed on top of another window, the covered window is instantly transformed into a pictorial representation or icon, and displayed at the base of the screen. "It's the metaphor of the neat desktop," said Steve Bulmer, Microsoft vice-president for marketing. He said that after an extended internal debate about the philosophy of designing window managers, Microsoft had settled on a user interface that will handle many window-sizing functions automatically. Bulmer claimed that the tiled approach to windowing is a more intuitive and predictable user interface. He says that a user can change window size or position with a single mouse click. Info World 1987 The Info World magazine April 6, 1987 reports that the change to overlapping windows would be a result of the OS/2 collaboration with IBM: Windows 2.0 to Resemble OS/2 Windows Manager Microsoft has launched an effort to transform the appearance of the control software. The firm announced last week it would make available a new version of Windows, called Version 2.0, in the third quarter that would have a new visual appearance identical to the OS/2 Windows Presentation Manager. The new appearance is the result of a development agreement between Microsoft and IBM, and the main difference is that windows now overlap instead of "tile." Windows 2.0 offers the same external appearance as the Windows Presentation Manager, but it's compatible with the existing applications and device drivers written for the current Windows. Technical capability I initially expected that there could have been technical limitations such as inability to interact with the windows underneath the popup window. But that appears to not be true, as I have tried myself with the "Cardfile" popups in online emulator. They are fully movable, can overlap other tiled applications and the windows underneath can be interacted with. They are not resizable, but that is probably an application choice for dialogs. PC Magazine 1984 The PC Magazine June 12, 1984 notes that the technical capability is present: Although I said earlier that Microsoft has used window tiling to display multiple sources of information simultaneously, the truth is that tiling is only the preferred technique. If software developers wish to employ windows that overlap, then they may do so. If developers wish to employ Macintosh-style windows (but not icons), they may also do so. However, Microsoft has included all the necessary code to draw standard Microsoft windows if developers include the right calls in their applications. Conclusion These sources align with the BetaWiki claim that the tiling was a design decision rather than legal or technical limitation. It could have made more sense at the time when you consider how many Microsoft users would have been unfamiliar with GUIs and mouse usage. The tiling windows as implemented by Windows 1.0 offer less chances for confusion, such as losing a non-minimized window behind another window. Remember that the innovation of the task bar that shows all open windows came much later with Windows 95. Share Improve this answer Follow answered 13 hours ago jpa's user avatar jpa 2,33199 silver badges2222 bronze badges 2 * 2 Possible addition for the conclusion, there were a number of ASCII text mode programs that used tiled 'views' for various purposes, including I think word star so tiling the windows 1 way would be the 'less confusing' behavior to those users. GremlinWranger - GremlinWranger 2026-03-04 09:25:30 +00:00 Commented 13 hours ago * Am I the only one who finds Steve Ballmer being called "Bulmer" hilarious? Jim Nelson - Jim Nelson 2026-03-04 21:02:45 +00:00 Commented 1 hour ago Add a comment | You must log in to answer this question. Start asking to get answers Find the answer to your question by asking. 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