This feature makes it easy to forward an abstract to a colleague.
Open the abstract you are interested in. Then go to the 'Bookmark & Share This Article' menu on the left-hand side of the page and click on 'Email Abstract'. This will open a new page where you should enter your name and email address, and your colleague's name, department and email address into the relevant boxes. If you want to add a message you can do so in the 'Message' box. Click 'Submit' to send the email.
Note: if you have access to the full text of the article, this feature is also available from the HTML version, similarly under the 'Bookmark & Share This Article' menu.