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Point to Point Message Passing
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Collective Communication -- messages between >2 simultaneous processes
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Support for Process Groups -- messaging in subsets of processors
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Support for communication contexts -- general specification of message labels and ensuring unique to a set of routines as in a precompiled library
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Note a communicator incorporates contexts and groups as single data structure and defines the scope of communication operation
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Support for application (virtual) topologies analogous to distribution types in HPF
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Inquiry routines to find out about environment such as number of processors
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