asterisk users - Jun 2006 - Asterisk realtime and metrics

Hello guys,
as you probably have already understood, I'm trying to make asterisk
realtime work.

Well, now it's working, but I'm not fully understanding the
"metrics".
In voip-info.org I found that they are a sort of "position" inside a
context (var_metric) or the index of the context (cat_metric). Am I
right?

Where can I obtain more info about these "metrics"?

Thanks in advance,

-- 
Andrea Spadaccini
Multimedia Technologies Institute s.r.l.