Processing WM_COMMAND Messages

When an accelerator is used, the window specified in the TranslateAccelerator function receives a WM_COMMAND or WM_SYSCOMMAND message. The low-order word of the wParam parameter contains the identifier of the accelerator. The window procedure examines the identifier to determine the source of the WM_COMMAND message and process the message accordingly.

Typically, if an accelerator corresponds to a menu item in the application, the accelerator and menu item are assigned the same identifier. If you need to know whether a given WM_COMMAND message was generated by an accelerator or by a menu item, you can examine the high-order word of the wParam parameter. If an accelerator generated the message, the high-order word is 1; if a menu item generated the message, the high-order word is 0.

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