Makes it easy to set up (semi)-timed page load events without messing with cron or other third-party timing scripts.
Some scripts have timing or cleanup processes (such as feed or RSS plugins), and the script writer has provided a page that needs to be loaded to 'run' these. Rather than trying to load the page in your browser at regular intervals, enter the URL here and the page will be loaded from WordPress.
No. It uses blog visitor page views to do the timing, so on a blog that's rarely visited, it may not be called often enough. As well, if there are a lot of URLs to visit in your list, there may not be time enough to reach them all. In this case, enter fewer URLs, or call them less often.