/sys$common/syshlp/helplib.hlb Sys Parameters, LGI_BRK_TERM  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    LGI_BRK_TERM causes the terminal name to be part of the
    association string for the terminal mode of break-in detection.
    When LGI_BRK_TERM is set to off (0), the processing considers
    the local or remote source of the attempt, allowing break-in
    detection to correlate failed access attempts across multiple
    terminal devices. When set to on (1), LGI_BRK_TERM assumes that
    only local hard-wired or dedicated terminals are in use and
    causes breakin detection processing to include the specific local
    terminal name when examining and correlating break-in attempts.

    Ordinarily, LGI_BRK_TERM should be set to off (0) when physical
    terminal names are created dynamically, such as when network
    protocols like LAT and Telnet are in use.

    LGI_BRK_TERM is a DYNAMIC parameter.