This message returns the location of the selection. 

param1
     USHORT  usQueryMode  /*  Query Mode. */

param2
     ULONG   ulReserved   /*  Reserved value, should be 0. */

returns
     SHORT   sMinSel      /*  Minimum insertion point of selection. */
     SHORT   sMaxSel      /*  Maximum insertion point of selection. */
     IPT     ipt          /*  Requested insertion point. */

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