The IXLSYNCH service is called from the notify exit to update information in the notify exit parameter list (NEPL). The IXLSYNCH service is the only method of successfully updating this information before the notify exit returns control to the system. If the connected user makes changes to the NEPL and does not invoke the IXLSYNCH service, the changes to the NEPL are ignored.

The IXLYNEPL macro provides the format of notify exit parameter list. Include that macro in your program.