EXPLANATION OF THE PROGRAM:
The program is similar to earlier sample code .The only difference is w.r.t the WM_COMMAND message and lpszMenuName parameter of the WNDCLASS structure.
MAKEINTRESOURCE macro is used define to convert the integer identifier of the menu resources into a character string which can be identified a resource.
WM_COMMAND message is generated when you click a menu item. If the sub menu options selected then wParam parameter will store the ID of that option.
For example ID_MESSAGE and ID_QUIT.
And lParam contains additional information like handle to the control etc.
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