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•The most popular operating system to run CICS is OS/390.
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•The Red boxes show the services under control of CICS. These include the program API, Basic
Mapping Services (BMS), and Terminal Control
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•The White boxes show the services under control of the
operating system, in this case OS/390.
These services include communication protocols, such as TCP/IP, the databases and file systems that
store data, such as DB2, and the actual application program that will
accomplish the task.
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•The Blue box represents the outside user of the
system. This is the end user of the
CICS application.[Menendez]
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