uscmd (USHORT)

      Command value.

      It is the responsibility of the application to be able to relate uscmd to an application function.

    ussource (USHORT)

      Source type.

      Identifies the type of control:

      CMDSRC_PUSHBUTTON

        Posted by a push-button control. uscmd is the window identity of the push button.
      CMDSRC_MENU
        Posted by a menu control. uscmd is the identity of the menu item.
      CMDSRC_ACCELERATOR
        Posted as the result of an accelerator. uscmd is the accelerator command value.
      CMDSRC_FONTDLG
        Font dialog. uscmd is the identity of the font dialog.
      CMDSRC_FILEDLG
        File dialog. uscmd is the identity of the file dialog.
      CMDSRC_OTHER
        Other source. uscmd gives further control-specific information defined for each control type.

      uspointer (USHORT)

        Pointer-device indicator.

        TRUE

          The message is posted as a result of a pointer-device operation.
        FALSE
          The message is posted as a result of a keyboard operation.

        ulReserved (ULONG)

          Reserved value, should be 0.

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