For the cause of this message, see WM_CONTROL.

param1
     USHORT       usid           /*  Control window identity. */
     USHORT       usnotifycode   /*  Notify code. */

param2
     ULONG        ulOver         /*  Number of bytes that do not fit. */
     PIX          pixOver        /*  Linear distance of overflow in pels. */
     POVERFLOW    pErrInfo       /*  Overflow error information structure. */
     ULONG        ulErrInd       /*  Clipboard fail flag. */
     PMARGSTRUCT  pmrg           /*  Margin structure. */
     IPT          iptSearchedTo  /*  Current insertion point of search. */
     ULONG        ulReserved     /*  Reserved value, should be 0. */

returns
     BOOL         rc             /*  Action taken by application. */
     ULONG        ulReserved     /*  Reserved value, should be 0. */