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is the common name for a keyboard shortcut that has been in Microsoft Windows since Windows 3.0. This shortcut switches between top-level windows without using the mouse; hence it was named ''Task Switcher'' (''Flip'' in Windows Vista). Perhaps the most common use of is to alternate between the two most recent tasks, but it can also be used to switch to any running program that has a top-level window. The window environment maintains a Z-order list of top-level windows (tasks) with the most recently used tasks at the front, so the most recently used tasks can be switched to the most quickly. The keyboard combination has also been incorporated in other operating systems and desktop environments such as Mac OS X (as ), KDE, Xfce, and GNOME. == Behavior == The use of the modifier key in using differs from typical modifier key use in the following ways: * There is a difference in behavior when the user releases and presses again vs. holding continuously while pressing repeatedly. * Releasing has an immediate effect: it closes the task switcher and switches to the selected task. There are many subtleties to the behavior of , and they have remained mostly unchanged over the years. The behavior follows these rules: * If there is more than one top-level window, the task list appears as soon as is pressed for the first time while is being held down. * The task list remains open until is released. * moves the cursor forward in the list; moves it backward. * or will autorepeat if held down (useful if there are many windows). * With the initial press of or , the selection cursor starts on the window immediately following or immediately preceding the active one. * If there are no topmost windows above the active window, an initial wraps the cursor around to the end of the list. * Using the mouse to click on a task icon in the task window switches to that task (does not work on Windows XP and earlier). * Pressing or clicking the mouse outside of the task window while is still down cancels the switch. * The windows are listed by their Z-order. * Any windows that are "always on top" are placed at the front of the Z-order sequence, followed by the current window and the windows underneath it. * Switching to a window moves it to the front of the Z-order, with the exception that "always on top" windows remain topmost and at the front of the list. * When the task switcher window is not active, places the active window at the bottom of the Z-order. In Windows 8 the behavior has changed: the window will be moved one level down the Z-order instead of going to the end. * is equivalent to one except that minimized windows are selected without being restored. * Minimizing a window also sends it to the back of the Z-order in the same way as . The rules have the following consequences: * In the absence of "always on top" windows such as Task Manager, pressing , pressing , releasing , and releasing (the typical way keyboard modifiers are used) will always alternate between the two most recent tasks. * can restore the most recently minimized window. (If there are "always on top" windows, the lowest of these will be selected instead.) * Pressing - (two tabs with continuously held down) performs the same quick switch back and forth, but between three programs. Any number of presses can be used to achieve this with any number of windows. When the task list is initially activated by pressing , the list is populated in this order: * Any always-on-top' top-level windows'' according to Z-order, front-to-back. * All ''ordinary top-level windows'' according to Z-order, front-to-back. The task list does not change order while it is open, but the order of tasks can change between invocations of the task list. Windows Vista changed the default behavior (under most default installations) with its Flip interface. The six most recently used items in the Flip order work as described, then remaining windows are ordered alphabetically by application path (and optionally grouped, depending on the 'group similar taskbar buttons' setting which is enabled by default). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Alt-Tab」の詳細全文を読む スポンサード リンク
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