Do you use the CICS Transaction Gateway to connect to your CICS server ?
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In 2014 I had a blog entry on the CICS Transaction Gateway (CTG), where I described how CTG requests are processed. That blog entry is here.
The CICS Transaction Gateway for multiplatforms (CTG) provides an API, that may be used in Java applications for multi-user access to CICS servers such as CICS Transaction Server for VSE/ESA 1.1.1 (CICS TS) or CICS TS for z/VSE 2.1. You may communicate from CTG to CICS TS via ECI (External Call Interface) calls over TCP/IP or SNA. The CTG directly connects to the CICS TS for z/VSE server.
The latest release is CICS Transaction Gateway V9.2, released in March 2016. More details about this release are in the corresponding announcement letter - here.