Library /sys$common/syshlp/tracehlp.hlb START, /LIVE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    /LIVE
    /NOLIVE

    Determines whether tracing and analysis are done in real  time,  or
    whether the unanalyzed data is stored in a file for later analysis.

    If you specify /NOLIVE a detached process is created  which  writes
    trace  records  to  a  file.  If you specify /LIVE, analyzed output
    will appear on your screen.  You can then issue ANALYZE commands to
    change the type of analysis performed.

    /LIVE is not valid with /PRIORITY, /OUTPUT, /BLOCKS, /VERSION_LIMIT
    or /PROCESS_NAME.

    In addition a number of analysis options may be specified if  /LIVE
    is  specified.   These are /PAGE, /WIDTH, /DATA, /TRUNCATE, /EVENT,
    /DISPLAY,    /REVERSE,    /PROTOCOL,     /SELECT,     /NAME     and
    /SAVE_BUFFER_SIZE.  These qualifiers are only valid with /LIVE.

    The default is /NOLIVE.

    Additional analysis options are available for  specific  protocols,
    refer to the relevant product documentation for details.