/sys$common/syshlp/HELPLIB.HLB  —  Sys Parameters, IOTA
    IOTA specifies the amount of time (in 10-millisecond units) to
    charge to the current residence quantum for each voluntary wait.
    The correct value approximates the cost of a disk I/O neglecting
    wait time.

    This special parameter is used by HP and is subject to change. Do
    not change this parameter unless HP recommends that you do so.
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