Library /sys$common/syshlp/helplib.hlb  —  CRTL  read  Description
    The read function returns the number of bytes read. The return
    value does not necessarily equal nbytes. For example, if the
    input is from a terminal, at most one line of characters is read.

                                   NOTE

       The read function does not span record boundaries in a
       record file and, therefore, reads at most one record. A
       separate read must be done for each record.
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