I have a dream ...

"The entertainment system was belting out the Beatles "We Can Work It Out" when the phone rang. When Pete answered, his phone turned the sound down by sending a message to all other local devices that had a volume control.

...

His sister, Lucy, was on the line from the doctor’s office At the doctor’s office, Lucy instructed her Semantic Web agent through her handheld Web browser. The agent promptly retrieved information about ...”

(Da: The Semantic Web, by Tim Berners-Lee, James Hendler and Ora Lassila, Scientific American, May 2001)