WindowsApi:WM KEYUP
Posted to the window with the keyboard focus when a nonsystem key is released. A nonsystem key is a key that is pressed when the ALT key is not pressed, or a keyboard key that is pressed when a window has the keyboard focus.
See also
Favorite site
- [http://msdn.microsoft.com/en-us/library/windows/desktop/ms646281(v=vs.85.aspx MSDN: WM_KEYUP message]