Library /sys$common/syshlp/ncphelp.hlb SET, NODE, SERVICE NODE VERSION version  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Specifies the DECnet for OpenVMS software version of the node which
 downline loads its software to a target node.  The two  possible
 versions are PHASE III and PHASE IV.  The default is PHASE IV.