Library /sys$common/syshlp/latcp$help.hlb SHOW, PORT, Parameter  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 port-name

    Specifies the name of the port for which information is
    displayed. If you do not specify a port name, the SHOW PORT
    command displays the characteristics for all LTAn: ports on a
    node.

    Do not use the /APPLICATION, /DEDICATED, /FORWARD, or
    /INTERACTIVE qualifiers with a specific port name.

    In addition do not use the /LIMITED qualifier with a specific
    port name.