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M

Mainframe
In the context of this web site, mainframe refers to an IBM (or "plug compatible") mainframe computer.

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message
In the context of IBM's MQSeries; a communication sent between two programs.

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Message Channel
In the context of IBM's MQSeries; a mechanism for moving messages from one queue manager to another in a distributed queuing environment. A message consists of two message channel agents ( a sender at one end and a receiver at the other end) and a communication link.

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Message Channel Interface (MCI)
In the context of IBM's MQSeries; the interface to which customer or ISV written programs that transmit messages between an MQSeries queue manager and another messaging system must conform.

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Message Queue Interface (MQI)
In the context of IBM's MQSeries; the API provided by the MQSeries queue managers. This programming interface allows application programs to access message queuing services.

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Message Queue Interface Channel (MQI channel)
In the context of IBM's MQSeries; an MQI channel connects an MQSeries client to a queue manager on a server system and transfers only MQI calls and responses in a bidirectional manner.

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method
(1) A fragment of Java code within a class that can be invoked and passed a set of parameters to perform a specific class.

(2) Code that can be executed to perform a specific request. Methods associated with an object can be structured into one or more programs.

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Millions of Instructions Per Second (MIPS)
The traditional measurement of mainframe CPU capacity and performance i.e how many million machine instructions the CPU can, on average, process in a second.

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MQSeries
The IBM MQSeries family of products, which provide an open, scalable, industrial strength messaging and information infrastructure, enabling enterprises (and their customers, business partners etc.) to integrate business processes.

IBM has recently "rebranded" the MQSeries family of products as the "WebSphere MQ" family of products.

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Multiple Virtual Storage (MVS)
An IBM operating system for processing systems consisting of one or more mainframe processors.

MVS has evolved along with mainframe hardware over the years and although the term MVS is still generally used and understood the operating system has had many different names:

z/OS is the current name given to the 64-bit operating system.

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Multipurpose Internet Mail Extensions (MIME)
A standard for multi-part, multimedia electronic mail messages and World Wide Web (WWW) hypertext documents on the Internet. MIME provides the ability to transfer non-textual data, such as graphics, audio and fax.

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Multi-Region Operation (MRO)
Is a function of the CICS Inter-Region Communication facility, which enables communication between CICS regions.

A "classic" CICS environment could consist of:

All regions communicating via MRO links (connections and sessions).

Cross-system Multi-Region Operation (XCF/MRO) is an extension to MRO, which enables the same communication between mainframes in a sysplex using cross-memory services and the Coupling Facility (CF).

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