Windows 2000/XP: The user completed an input event (for example, pressed an application command button on the mouse or an application command key on the keyboard), and the application did not handle the WM_APPCOMMAND message generated by that input.

• 用户完成一个输入事件(例如，按下应用程序鼠标上的命令按钮或者键盘上的命令键)，应用程序没有处理由该输入产生的WM_APPCOMMAND消息。