Your question is a bit vague, but it sounds like you could use 'wget' in a cron job to fetch from a URL on a regular basis. You would probably want to compare the newly fetched data to the last copy received, and if different, do 'the right thing', whatever you deem that to be. I can tell you that many system administrators will dislike you for doing this, especially if you are hitting the web server very frequently.
You might get more/better answers if you supplied a bit more detail about what you are trying to accomplish.
--- rod.
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