make a layer "queryable"

[Nate Reed]

Can someone point me to some documentation for how to make a MapServer 
layer "queryable" (this was the term used in Chameleon's documentation)?

I am setting up a WMS server and want to use Chameleon or some other 
WMS-capable client to deliver maps and to provide querying functionality.  
I assume supporting query involves using another OGC protocol (WCS)?

Thanks

-- 
Nate Reed
Physical Oceanography DAAC
Jet Propulsion Lab / Raytheon ITSS
(626)744-5528  nate at seastar.jpl.nasa.gov