Open ClientConnect is a programming environment that provides Open Client Client-Library routines for use in building mainframe client applications.
Open ClientConnect runs on an IBM System/390 or plug-compatible mainframe computer. It uses the LU 6.2 or TCP/IP communications protocols and is available for CICS, IMS TM, and native MVS host transaction processors.
Some information in this guide is specific to version
4.0 of Open ClientConnect. This information will apply to Open ClientConnect
for CICS only. All other information will apply both to Open ClientConnect for
CICS and Open ClientConnect for IMS and MVS.
Open ClientConnect applications can communicate with two kinds of servers:
Adaptive Server Enterprise and Open Server™ on PCs and several mid-range UNIX platforms.
Open ServerConnect applications running in a separate region on the mainframe.
Open ClientConnect applications can send requests to Adaptive Server Enterprise, Open ServerConnect applications, and Mainframe Connect for DB2 UDB (or OmniSQL Access Module™ for DB2).
Open ClientConnect applications can send requests to Adaptive Server Enterprise indirectly through either of the following:
The three-tier (gateway-enabled) environment using Mainframe ClientConnect (MCC).
The two-tier (gateway-less) environment using TCP. See “Two-tier (gateway-less) environment” for more information on two-tier environments.
Open ClientConnect applications can send requests directly to Open ServerConnect running in a different CICS region. If using TCP, Open ClientConnect may send requests to Open ServerConnect running in the same CICS region.
Due to an IBM SNA restriction, connections from Open
ClientConnect to Open ServerConnect require that they reside in
different regions when connecting through LU 6.2. For TCP/IP,
they can reside in the same region.
