about cache filter

Hi,

I see there are at least cache filter in Jigsaw:
(1)org.w3c.jigsaw.filters.CacheFilter
(2)org.w3c.jigsaw.filters.SimpleCacheFilter
(3)org.w3c.www.protocol.http.cache.CacheFilter
However, I can only see the first one in my Jigsaw
Admin. I want to know how can I use all other filters
and frames.

Thank you very much!

Red K

__________________________________________________
Do You Yahoo!?
Faster. Easier. Bingo. 
http://sg.search.yahoo.com