A peculiarity of the X Window System: windows all the way down
Every window system has windows, as an entity. Usually we think of these as being used for, well, windows and window like things; application windows, those extremely annoying pop-up modal dialogs that are always interrupting you at the wrong time, even perhaps things like pop-up menus. In its original state, X has more windows than that. Part of how and why it does this is that X allows windows to nest insi … ⌘ Read more