Library /sys$common/syshlp/helplib.hlb
SET, HOST, Qualifiers, /APPLICATION_PROTOCOL
 *Conan The Librarian 

       /APPLICATION_PROTOCOL[=protocol]

    Specifies the protocol connection, CTERM (CTDRIVER) or RTERM
    (RTTDRIVER) on the specified node. CTERM protocol is the default
    if no connection is specified.
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