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    SubjectRe: Network performance
      Date: Sat, 29 Jun 1996 21:37:15 -0400 (EDT)
    From: Kevin M Bealer <kmb203@psu.edu>

    I don't understand -- what does the $(VAR) refer to? Which process's
    environment is used for $(VAR)? Or is VAR not an environmental variable?

    The process making the call, of course.

    If it is an environmental variable, wouldn't the environment have to be
    passed around?

    Well, I don't recall whether this was in user space or not (it has been a
    while). It may well be that the kernel simply maintained a pointer to the user
    environment, and so had it available for reference when the kernel mapped a
    name into an object.

    Leonard


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