RefGrab-It is an optional feature for capturing bibliographic information from web pages. It is available as a bookmarklet that works with Internet Explorer and Firefox.
RefGrab-It looks for information on web pages and if an ISBN number, PubMed ID or (digital object identifier) or COinS (ContextObjects in Spans -- special coding embedded in the web page that RefWorks will read) are on the web page, RefGrab-It will automatically take that information search various web resources (behind the scenes) to get supplemental information that may be of interest to you that you can also import.
You can find RefGrab-It under the Tools tab of the main navigation menu. Instructions for the installation can also be found there.