Library /sys$common/syshlp/helplib.hlb  —  CRTL  pread  Arguments
 file_desc

    A file descriptor that refers to a file currently opened for
    reading.

 buffer

    The address of contiguous storage in which the input data is
    placed.

 nbytes

    The maximum number of bytes involved in the read operation.

 offset

    The offset for the desired position inside the file.
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