The Inter User Communications Vehicle (IUCV) is a communication facility that allows a program running on a virtual machine to communicate with other virtual machines, with a CP system service, and with itself.
An IUCV communication takes place between a source communicator and a target communicator. The communication takes place over a predefined linkage called a path. Each communicator can have multiple paths, and can receive or send multiple messages on the same path simultaneously. This helps avoid programming conflicts by taking advantage of a multi-processing environment.
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