To begin monitoring a particular sublist, you invoke the IXLLIST macro with REQUEST=MONITOR_SUBLIST and ACTION=START. You also specify the list number (LISTNUM), the entry key of the sublist (ENTRYKEY), the connect token (CONTOKEN) that was returned when you connected to the structure, and any user notification control information that your processing might require (UNC). This information is associated with the EMC for this user/sublist combination.

To update your registered interest in monitoring a particular sublist, you can reissue the IXLLIST REQUEST=MONITOR_SUBLIST specifying the same sublist but with different user notification control information. The system replaces the UNC information in the existing EMC that is associated with the user/sublist combination.