Library /sys$common/syshlp/ncphelp.hlb SET, MODULE, X25-SERVER, KNOWN DESTINATIONS, OBJECT object-id  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Identifies the object used in connecting to a host node for
 incoming calls to a destination.  The object-id is an ID string.
 If the object name looks like a number, enclose the string in
 quotation marks.  This parameter is mandatory when you specify a
 destination for the first time.