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

       /FORWARD_SESSION_LIMIT[=value]

    Controls the number of sessions (a value within a range from 16
    through 255) allowed on each outgoing connection. By default, 16
    sessions are allowed on an outgoing connection, which means that
    16 individual processes can direct the DCL command, SET HOST/LAT,
    to the same remote node.

    You must increase the value for the /FORWARD_SESSION_LIMIT
    qualifier if a user on your system enters the command,
    SET HOST/LAT, and receives an error message indicating that the
    session limit for the LAT circuit has been reached ( %LAT-F-
    VCSESLIM). Note, however, that you can change this value only
    when no connections exist.