There is no difference in the use of Gateway-Library functions for SNA or TCP/IP networks.
In three-tier environments, the TRS administrator defines a group of TCP/IP communication sessions connecting a mainframe teleprocessing region with a remote port on a TRS. For detailed information about configuring TRS, see the Mainframe Connect DirectConnect for z/OS Option User's Guide for Transaction Router Services.
In two-tier environments, LAN clients directly login to Open ServerConnect using TCP/IP for connectivity. For information, see the Mainframe Connect Server Option Installation and Administration Guide.
