Library /sys$common/syshlp/ncphelp.hlb SET, EXECUTOR, DNS NAMESPACE string  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Specify this parameter if you want to use the DNS INTERFACE.
 Specifies an existing DECdns namespace used by the DNS interface.  If
 DNS INTERFACE is ENABLED and you omit the DNS NAMESPACE parameter,
 DECnet for OpenVMS uses  the default DECdns namespace for node name
 and address lookups.  This string value must be 1 to 256 alphanumeric
 characters, and can include the dollar sign ($), underscore (_), and
 hyphen (-) characters.