A tip for ya... a simple search using a search engine will provide the answers to the questions you have.

search engine
A program that searches documents for specified keywords and returns a list of the documents where the keywords were found. Although search engine is really a general class of programs, the term is often used to specifically describe systems like Alta Vista and Excite that enable users to search for documents on the World Wide Web and USENET newsgroups.

Typically, a search engine works by sending out a spider to fetch as many documents as possible. Another program, called an indexer, then reads these documents and creates an index based on the words contained in each document. Each search engine uses a proprietary algorithm to create its indices such that, ideally, only meaningful results are returned for each query
http://www.webopedia.com/TERM/s/search_engine.html

My personal favorite is http://www.google.com

L3 cache
As more and more processors begin to include L2 cache into their architectures, Level 3 cache is now the name for the extra cache built into motherboards between the microprocessor and the main memory.

Quite simply, what was once L2 cache on motherboards now becomes L3 cache when used with microprocessors containing built-in L2 caches.
http://www.webopedia.com/TERM/L/L3_cache.html

L3 cache is even covered in a link I provided earlier in the thread.
http://www.pccomputernotes.com/cache/cache02.htm