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yes, it is possible to grab data from another server via sockets (you can act as a browser and send an http request to the server)...or perhaps an XML request to the page if they wold consider creating a web service
If you want to post to their site, you'd need to talk to them and have them include your info in (as in a frame or something else like that)
You would need to talk with them about merging content, otherwise you might violate copywrite...