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IBM CICS and the Coupling Facility: Beyond the Basics by Kellie Mathis, Rich Jackson, Randy Frerking, Arndt Eade

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Coupling facility data tables
Coupling facility data tables (CFDTs) provide a method of file data sharing, using CICS file control, without the need for a file owning region (FOR) and without the need for Virtual Storage Access Method (VSAM) record-level sharing (RLS) support. CICS CFDT support provides rapid sharing of working data within a sysplex, with update integrity.
The data is held in an IBM Coupling Facility (CF) in a table that is similar to a shared user-maintained data table. Because read access and write access have similar performance, ...

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