Using Settings

I never seem to get this right

What's the idiomatic way to use settings?

For example, I'm just starting a new project (called 'crane'). Like usual, I have a debug.pl that
starts the system up in debug mode. 

:- module(debug, []).

I then define a setting

:- setting(crane_debug_port, positive_integer, 14000, 'Port to run the Crane Game on in debug mode.').

In debug mode I want pldoc available, so I let the doc server be the server.

:- setting(crane_debug_port, Port), doc_server(Port).

Oops - 

>ERROR: c:/docs/jondorbolo/quickygame/crane/crane/prolog/debug.pl:62:
        setting `debug:crane_debug_port' does not exist
Warning: c:/docs/jondorbolo/quickygame/crane/crane/prolog/debug.pl:62:
        Goal (directive) failed: debug: (setting(crane_debug_port,_G130),doc_server(_G130))

changing all occurrences of crane_debug_port to crane:crane_debug_port   fixes it.

OK, but I'm still not clear what the canonical way to do this is.

First, if I was using, rather than writing, this code, and wanted debug to run on 16000,
instead of 14000, I'd add a setting to program files\swipl\customize\pl.ini  ?

But no, apparently it's to 



Installation:

Unix/MacOS:~/.plrc
Windows:<appdata>/pl.ini (see win_folder(appdata, AppData))



which would be set_setting?

I'm baffled.
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