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For websites you can enter a link and it will check the HTTP status code. If the HTTP status code is in the 4xx range or a timeout, it means an error occurred and the tool will start sending out notifications. You can also set a regular expression to match for content on the page itself.
Each server has its own settings regarding notification. You can choose for email, text message (SMS) and Pushover.net notifications.
For more info please visit http://www.phpservermonitor.org