You can customize your NCL environment using optional
    initialization files.  In addition, on OpenVMS you have the
    option of using a keypad definition file.  Tru64 UNIX
    allows you to define symbols for use with NCL.

    Setting a default NCL context is another way of customizing
    your NCL environment.  This allows you to specify a particular
    entity or default access control information to be used for
    the remainder of an NCL session.  For information on setting a
    default NCL context, refer to HELP NCL DEFAULT_CONTEXT.