Enhancement of the gnome-search-tool

[Deepak Mishra <dpux4linux gmail com>]

Hello list !!
I am new to this list, and very new to desktop search
too. Please pardon me any behavior not suited to the list. 
I am still reading a lot to know the exact search process. My doubts (and they are a lot !) are hence very basic.
As users me and my friends are not very much
impressed by the default search in GNOME (by the gnome-search-tool), and I aim at enhancing
that tool. Even after a lot of googling I am yet to find out what
indexing process does gnome-search-tool use as a backend.So can anyone
please tell me the search engine used by the tool ?
I have also been through the beagle architecture and got to know that
it uses the LUCENE search engine at core. But I could not get to know
what search engine does tracker use, hope you people can tell me.
In
the gnome-love list people said that gnome-search-tool "probably" uses
libbeagle and libtracker. Is it true ? If it is, then why both ?? Any
one could do !
Earlier I always had a thought that gnome-search used the "find" or
"locate" utility in linux,but after going through it's source, I
discovered I was wrong. But I feel even the "find" utility must be
making an index for its use....cant we simply use it ? 

Hope you people will help me out soon !
Thanks in anticipation.
Deepak Mishra