MLM_RESETUNDO - Syntax

This message resets the undo state to indicate that no undo operations are possible.

param1
     ULONG   ulReserved   /*  Reserved value, should be 0. */

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

returns
     USHORT  usOperation  /*  Operation that can be undone or redone. */
     BOOL    rc           /*  Undo or redo indicator. */