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Recoverable Resource Management Services (RRMS)
Is a component of the MVS (OS/390 and z/OS) operating system. It manages and controls syncpoint and rollback processing across MVS address spaces and consists of three components or service types: -

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Resource Access Control Facility (RACF)
IBM's External Security Manager (ESM) software product, which controls access to resources in a mainframe environment. It can be used by products such as CICS to perform authorisation checking before access to resources is permitted.

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Restructured Extended Executor (REXX)
REXX is a high-level, procedural language used on MVS systems.

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