This message is sent to the clipboard viewer window whenever the contents of the clipboard change; that is, as a result of the WinCloseClipbrd function following a call to WinSetClipbrdData. 

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

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

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