EZASOKET in Enterprise Server is designed to emulate, as closely as possible, the IBM implementation documented in SC31-8518-01, "OS/390 SecureWay Communications Server: IP CICS Sockets Guide Version 2 Release 8" (1999). It also supports some, though not all, of the features introduced in the z/OS implementation documented in SC31-8807-02, "z/OS Communications Server: IP CICS Sockets Guide Version 1 Release 5" (2004).
However, there are some differences. EZASOKET makes use of the local platform's native TCP/IP support. Due to differences between TCP/IP implementations, there are some circumstances in which EZASOKET does not behave identically to the IBM implementation. These differences are documented in the section Notes on individual functions.