Quote database APIs

Is anyone familiar with some reference to accessing
various quote databases (whether historical, realtime,
free, or pay access) when writing their own client program
(Java, Perl, Python, whatever)?

I'm not interested in using a seperate application to
download data to local files, just acessing the server
database directly. I can see how URL hacking and CSV
parsing can be used to get data from Yahoo, but I was
looking for something more general.

Thanks.
 
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