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IMS Integration and Connectivity Across the Enterprise by Gary Wicks, Geoff Nicholls, Evgeni Liakhovich, Knut Kubein, Jenny Hung, Paolo Bruni

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Open Transaction Manager Access
Open Transaction Manager Access (OTMA) is a function of IMS that was introduced with IMS Version 5. OTMA is a transaction-based, connectionless client/server protocol that provides an access path and an interface for sending and receiving IMS transactions and data.
OTMA is implemented for IMS in an z/OS Sysplex-capable environment and runs in the IMS control region. Instead of using VTAM or TCP/IP, OTMA uses the MVS Cross Coupling Facility (XCF), which provides functions to support cooperation between authorized ...

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