Library /sys$common/syshlp/ncphelp.hlb SET, MODULE, X25-ACCESS, NODE node-id  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Specifies the multihost connector node connected to the PSDN that
 you want to access.  When you specify an X25-ACCESS network for
 the first time, this parameter is mandatory.