Very helpful, thank you!

Intriguing! How do you suppose one might narrow the website catchment area for changes? Say, for when the score changes in a big game? I'd love to be able to trigger my lights to change color and flash when my beloved Reds score against Real Madrid in the coming champions League final....

That would require parsing the response (also known as "html scraping") and return that as the state! I'm sure there are open-source solutions for that (though I have no idea of any in particular), but one could also use regular expressions to capture the result.