/sys$common/syshlp/helplib.hlb System Services, $CREATE RDB, Argument  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 sysid

    OpenVMS usage:system_access_id
    type:         quadword (unsigned)
    access:       read only
    mechanism:    by reference
    System identification value associated with the rights database
    when $CREATE_RDB completes execution. The sysid argument is the
    address of a quadword containing the system identification value.
    If you omit sysid, the current system time in 64-bit format is
    used.