This message sets the zero-based offsets of the bounds of the text that forms the current selection. 

param1
     USHORT  usminsel    /*  Offset of the first character in the selection. */
     USHORT  usmaxsel    /*  Offset of the first character after the selection. */

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

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