The DECNET_REGISTER utility is normally invoked using the RUN command.
 It can also be invoked using a foreign command symbol.  For example:

     $ RUN SYS$SYSTEM:DECNET_REGISTER          !Invoke the utility

     $ NETREG :== $SYS$SYSTEM:DECNET_REGISTER  !Foreign command symbol
     $ NETREG                                  !Invoke the utility

 If a foreign command symbol is used, a command line can be passed directly
 to DECNET_REGISTER on the invocation command line.  For example:

     $ NETREG SHOW NODE MyNode

 If the utility is invoked by a foreign command symbol with a command line,
 as shown above, it executes the command and exits after the command is
 complete.  If not, it brings the main menu up on the screen and starts
 accepting function requests.