Web of Science covers all scholarly disciplines and can be used in two ways:
Years of coverage: 1955 to present. Updated weekly.
Subject coverage all scholarly disciplines - science, medicine, engineering, social sciences and humanities.
Types of content: journal articles. In the "cited reference" search, you can start with non-journal materials to see who has cited a particular book, report, etc., but the search results will be from journal articles.

Instructional Materials from the UC/UCSD Libraries:
Tutorial mini-movies from the Science & Engineering Library - includes clips on cited reference searching and setting up alerts.
From the vendor:

Tips and Tricks

For EndNote Users
Web of Science supports both direct exporting of citations as well as EndNote's own Connect tool. The Export function was recently changed and may "trip" your browser's security settings. Look for a warning message from your browser if the export process doesn't work as expected. Note: using the Connect tool you can only do General (ie, author or topic) searches, not Cited Reference searches.
For RefWorks Users
Save your desired results to your computer using the Tagged format. In RefWorks, use the References/Import function to import them into your RefWorks library. Choose Import Filter/Data Source: ISI and Database: Web of Science.
Alternative: if you are working on a computer where you cannot download files, you can e-mail the records to yourself from ISI, choosing the Tagged format and Plain Text formatting. You can then copy and paste the body of the e-mail into the Import tool in Refworks, in the lower box marked "Import Data from the following Text."