Documents are listed showing type, title and the availability of an abstract as:

PDF (Acrobat)  Document Title

Abstract

PPT (Power Point) Document Title

no abstract

In the list of documents, select either the document title or the icon to the left to display the document.  If there is an abstract available, the word Abstract appears as a link in the right column.  Selecting this link will display the abstract in a popup window like this one.