1 Prompting

NCP prompts for required components and parameters if they are not
supplied when you issue the command.  Each prompt is either a list of
admissible keywords for that position in the command syntax or the
name of a parameter and a description of the value required.

Prompting will not occur when NCP receives input from a command file.
Parameter keywords must be supplied in command files.

Each prompt consists of two parts:  the component or parameter desired,
and its format.  The format of prompts is as follows:

        Component (Format):

All underscores found in parameters must be replaced with spaces
when parameters are used in NCP commands.
 
2 Format_of_prompts

The component part indicates the name of either the component or
parameter.  The format part indicates the range of acceptable values.
The format part presents keywords in uppercase, value classes in
lowercase as descriptive strings, and numeric ranges as two numbers
separated by a hyphen.  Commas indicate alternatives which are mutually
exclusive.

2 Exiting_the_Prompting_Sequence

You can exit a prompting sequence by responding with CTRL/Z for the
prompt. This returns you to the NCP> prompt where you can then issue
another NCP command. You can exit NCP directly from the prompting
sequence by responding with CTRL/C or CTRL/Y.

Responding to a parameter prompt or query with "_DONE" skips the
remainder of the prompts or queries and performs the requested
function with the parameters which have been entered up to that point.

2 Examples

The following examples illustrate three types of prompting that NCP
provides.

Prompts to supply missing command component keywords:

        NCP>CLEAR <RIGHT>
        (LINE, CIRCUIT, LOGGING, KNOWN, NODE, OBJECT):

No component is specified for the CLEAR command.  The prompt format is
a list of admissible component keywords separated by commas.  Note
that the plural keyword KNOWN is included in this list.

Prompts to supply parameter values:

        NCP>CLEAR LINE <RIGHT>
        LINE ID (dev-c-u.t):

NCP prompts for the line-id for this component since it is not provided 
with the command.

The following example shows variations of the prompting scheme for
parameter values:

        NCP>SET EXECUTOR <RIGHT>
        Node address           (1.1-63.1023): 2.11
        State    (ON, OFF, SHUT, RESTRICTED): ON
        ...
        Pipeline quota       (0-65535 bytes):6000

Prompts to select parameter names:

        NCP>CLEAR LINE <RIGHT>
        Line ID       (dev-c-u.t): DMC-1
        All line parameters (Y,N):

NCP prompts for the selected parameter names whose values are to be
removed from the database.   In this case, no parameter name was given;  
consequently, NCP asks if all values  should  be  removed.   Y indicates  
that all values should be removed.  N causes NCP to provide a different 
response.  For example,

        NCP>CLEAR NODE BOSTON <RIGHT>
        All node parameters (Y,N): N
        Host node           (Y,N): Y
        Identification      (Y,N): N
        ...
        Service password    (Y,N): Y
        Tertiary loader     (Y,N): N

Since N is the response to the first prompt above, NCP prompts for all
of the parameter names.

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