Library /sys$common/syshlp/nclhelp.hlb create, x25 client (OpenVMS), maximum_session_connections  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Maximum number of concurrent Session Control connections that can
    be supported by the X.25 Client module. This argument determines
    the value of the maximum session connections characteristic. If
    not specified, the implementation-specific default value of the
    characteristic maximum session connections is used.