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Menu-item Identifier
Associated with each menu item is a unique, application-defined integer,
called a menu-item identifier. When the user chooses a command item from a menu, Windows sends the item's
identifier to the owner window as part of a WM_COMMAND message. The window procedure examines the identifier to determine the source
of the message, and processes the message accordingly. In addition, you can
specify a menu item using its identifier when you call menu functions; for
example, to enable or disable a menu item.
A menu-item identifier must be a value from 0 to 65,535, even though it is a
32-bit integer. This is because the WM_COMMAND message passes a menu-item
identifier as the low-order word of its wParam parameter.
Menu items that open submenus have identifiers just as command items do.
However, Windows does not send a command message when such an item is selected from
a menu. Instead, Windows opens the submenu associated with the menu item.
To retrieve the identifier of the menu item at a specified position, use the GetMenuItemID or GetMenuItemInfo function.
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