Lastest information on CME Market Data Handler is available online at OnixS website.
Programming Guide for the latest version is always available online.
Documentation uncovering aspects of CME Market Data Platform can be found on the CME Group Market Data Platform Wiki. It is highly recommended to get a general understanding of how client systems connect to and process data sent over CME Market Data platform.
Lost Multicast Packets Troubleshooting Guide represents a most recent version of an online guide helping to diagnose and resolve multicast packets loss.