This message is sent when a presentation parameter is set or removed dynamically from a window instance using the WinSetPresParam or WinRemovePresParam functions. It is also sent to all windows owned by the window whose presentation parameter was changed. 

param1
     ULONG  idAttrType  /*  Presentation parameter attribute identity. */

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

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