Meaning of Config

"Peter J Etheridge" <[email protected]>
Newsgroups gmane.comp.lang.erlang.general
Message-ID <[email protected]> 
Dear Erlangers,wx:demo() is such a valuable resource.
in each module we read;
start(Config) ->
....
Where might we find a definition or example of Config ?
Thank you in advance,
Peter
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