IMS™ TCP/IP using the IMS Listener and IMS Assist Module is designed for use on an MVS/SP host system running IMS/ESA® Version 4 or later.

A TCP/IP host can communicate with any remote IMS or non-IMS system that runs TCP/IP. The remote system can, for example, run a UNIX or OS/2 operating system.

TCP/IP services is not described in this information because it is a prerequisite for IMS TCP/IP. However, much material from the TCP/IP library has been repeated in this information in an attempt to make it independent of that library.