asterisk users - Nov 2009 - Where are documented channel-dependant Dial options ?

Hi,

I've recently discovered Dial examples such as
"Dial(DAHDI/g4d/${EXTEN})"
but I wonder where I can get an uptodate doc.

Is there any CLI option such as "core show channel dialoption" that
would
explain what "g4d" exactly means ?
"core show application dial" doesn't explain much about those
channel-dependant Dial options.

Regards
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