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IBM Communications Server

The system interfaces to IBM's Communications Server using the TCP/IP macro-level interface, which uses the HPNS (High Performance Native Sockets) facility.

This interface has the following restrictions:

• To use the PING and TRACEROUTE functions, the region RACF user ID must be in the TCP/IP OBEY list.
• The user ID must have an OMVS segment with a UID of 0.