Users can create custom alerts on Bloomberg, Lexis+, and Westlaw. Alerts can be used to monitor KeyCite or Shepard's citations to a case, save and receive periodic updates based on a saved search, and a variety of other uses.
In general, creating a custom alert can be as simple as clicking on a "bell" icon on Westlaw and Lexis or clicking "Create Alert" on Bloomberg Law after running a search or opening a document.
More information for each database is provided below