The EZACICAL API (described in this topic) and the Sockets Extended API (described in Sockets extended API) both provide sockets APIs for COBOL, PL/I, and Assembler language programs.

The Sockets Extended API is recommended because it has a simpler set of parameters for each call.

You might want to use the EZACICAL API if you have existing TCP/IP Version 2.2.1. for MVS™ COBOL/assembler language programs that require maintenance or modification.