# Clarification of borderless fullscreen and borderless windowed modes?

**URL:** <https://discourse.glfw.org/t/clarification-of-borderless-fullscreen-and-borderless-windowed-modes/1235>\
**Category:** support\
**Created:** [December 20, 2018, 11:53pm UTC](https://discourse.glfw.org/t/clarification-of-borderless-fullscreen-and-borderless-windowed-modes/1235 "2018-12-20T23:53:31Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![dougbinks](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.glfw.org/dougbinks/32/39_2.png) [@dougbinks](https://discourse.glfw.org/u/dougbinks)\
**Post date:** [December 21, 2018, 11:29am UTC](https://discourse.glfw.org/t/clarification-of-borderless-fullscreen-and-borderless-windowed-modes/1235/2 "2018-12-21T11:29:31Z")

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There are two main differences at the moment with your #3 and #4 on Windows (I’m not sure about other platforms, but your question was Win 8/10 related).

1. The fullscreen window is topmost, which you can replicate with [a floating window](https://www.glfw.org/docs/latest/window_guide.html#window_attribs_wnd).
2. SwapBuffers does not use [DwmFlush](https://github.com/glfw/glfw/blob/2de2589f910b1a85905f425be4d32f33cec092df/src/wgl_context.c#L270).

Topmost windows the exact size/position of the monitor have some special behaviour under windows, but I can’t find decent documentation on this nor if they completely avoid the DWM compositor.

There are some related issues on borderless windows you might want to follow:

> <https://github.com/glfw/glfw/issues/1267>

  
and  

> <https://github.com/glfw/glfw/issues/1144>

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_[View the full topic](https://discourse.glfw.org/t/clarification-of-borderless-fullscreen-and-borderless-windowed-modes/1235)._