Msg#: 3373063 posted 6:41 am on Jun 20, 2007 (gmt 0)
A lot of those numbers are generated automatically by the respective industries via their systems and output to XML data feeds. Different industries have different ways of going about it, but essentially you, or someone upstream from you, subscribes to these feeds. The data is then syndicated out to various webmasters.
Some of these feeds can be quite expensive. It depends on the industry and market I guess.