sending commands via ethernet

What is the best way to send /change temperature set points to an arduino preferably via an ethershield. I can get data to post on a webpage but am unsure how to change the set values.

thanks steve

Did you take a look at the examples of the Ethernet library in the Arduino IDE? You probably will find what you're looking for. If not, please specify exactly where the problems are and use the "Networking, Protocols and Devices" topic for it.