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.

    ulcontrolspec (ULONG)

      Control-specific information.

      The meaning of the control-specific information depends on the type of the control. For details, refer to the section describing that control.

    ulReserved (ULONG)

      Reserved value, should be 0.

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