Alerts notify you when information that interests you is added or updated on the portal site and associated content sources. You can define your areas of interest and identify how and when you want to be told about something new or updated that you may want to investigate. You can add an alert to track new matches to a search query, changes to content in an area, or a new site added to the Site Directory.
you can find more information in
by: Kadin C
on: 8th November 08