[Zope] RAMCacheManager Vs Cache manager in control panel

Hi, What is the difference between the cache settings in the control_panel compared to creating a RAMCachemanager for a specific site. Do they interact with each other or effect each other when you change settings? I guess the cache settings in the zope control panel effects all other caches, is this correct? Havn't been able to find much info about there use or how best to optomize them. Thanks for any help. Richard __________________________________________________ Do You Yahoo!? Everything you'll ever need on one web page from News and Sport to Email and Music Charts http://uk.my.yahoo.com