After DECNET_REGISTER is invoked, and after it has executed the
 initialization command file (if any), it enters either command
 line mode or forms mode.

 Command line mode is used if the utility is invoked from a command file
 or from a hardcopy terminal.  In this case, the utility accepts commands
 as described in this help file.

 Forms mode is used if the utility is invoked from a video terminal.

 The DECNET_REGISTER utility can be forced to always run in command
 line mode or forms mode by using one of the logical definitions:

     $ DEFINE DECNET_REGISTER_COMMANDS 1 !Force the use of command lines
     $ DEFINE DECNET_REGISTER_FORMS 1    !Force the use of forms

 If either of these is defined, DECNET_REGISTER uses the indicated
 interface mode, regardless of how it is invoked.

 The DECNET_REGISTER utility can also be forced to run in command line
 mode or forms mode by supplying one of the following arguments on
 the invocation command line:

     $ NETREG /C                    !Force the use of command lines
     $ NETREG /F                    !Force the use of forms

 To use these arguments, DECNET_REGISTER must be invoked using a foreign
 command symbol.

 If supplied, these arguments override both the I/O mode and the
 logical definitions.