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In computing, the menu key or application key (≣ Menu) is a key found on Microsoft Windows-oriented computer keyboards, introduced at the same time as the Windows logo key. Its symbol is usually a small icon depicting a pointer hovering above a menu, and it is typically found on the right side of the keyboard between the right Windows logo key and the right control key (or between the right alt key and the right control key). While the Windows key is present on the vast majority of keyboards intended for use with the Windows operating system, the menu key is frequently omitted in the interest of space, particularly on portable and laptop keyboards.
Some Windows public terminals do not have a Menu key on their keyboard to prevent users from right clicking; however, in many Windows applications, a similar functionality can be invoked with the ⇧ Shift+F10 keyboard shortcut, or sometimes Ctrl+⇧ Shift+F10.
Some laptop computers include a menu function on the fn key (usually operated by typing ⇧ Shift+Fn), however, this generally invokes functions built into the vendor's software and is not the same as the key described above. For example, the Logitech Illuminated Keyboard has an FN key where the menu key is usually found, pressing which together with its print screen key (above home), produces the Menu key function.
Programmers using the Windows API can intercept this key by looking for a WM_KEYDOWN message with wParam VK_APPS (defined as 0x5D in winuser.h). It has key code 117 (0x75).
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