VMS Help Sys Parameters, LGI_CALLOUTS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    LGI_CALLOUTS specifies the number of installation security policy
    callout modules to be invoked at each login. LGI_CALLOUTS must be
    set to 0 unless callout modules are present.

    LGI_CALLOUTS is a DYNAMIC parameter.