Query Cache is a new caching system for both Joomla 1.0 and Joomla 1.5 that caches SQL queries in memory.  Because it's only dealing with SQL data, it doesn't care if the user is logged in or not!  It will automatically delete stale queries (so your frontend is fresh)!!! Because it is memory based, you will need one of the following to use Query Cache

1. APC
2. XCache
3. Memcache

You can even write your own backend driver if you have another system...

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