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dialog box creation

Use DialogBoxParam to create a dialog box, and pass a application-defined value as the lParam parameter of the WM_INITDIALOG message;

    result = DialogBoxParam(g.hinstance, "racl_arg_dialog", 
                    hwnd, racl_arg_dialog_procedure, (LPARAM)&arg_data);

In this case, arg_data is a struct or class containing the information the dialog box acts on.