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6
Because HPF is designed as a high-level machine-independent language,
there are certain operations that are difficult or impossible to
express directly. For example, an application may benefit from
finely-tuned systolic communications on certain machines; HPF's global
address space does not express this well. HPF defines the Extrinsic
mechanism to facilitate interfacing with procedures written in other
paradigms, such as explicit message-passing subroutine libraries or in
other languages, such as C.
