id (USHORT)

      Control-window identity.

      This is either the parameter of the WinCreateWindow function or the identity of an item in a dialog template.

    usnotifycode (USHORT)

      Notify code.

      The meaning of the notify code depends on the type of the control. For details, refer to the section describing that control.

    ulZero (ULONG)

      Zero.

    • The control-specific information in ulcontrolspec of the WM_CONTROL message is not available because the information might not be valid when the application receives this message.

    ulReserved (ULONG)

      Reserved value, should be 0.

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