You now know that :link. makes text phrases and hypergraphic areas within a window selectable. When the user selects a hypertext or hypergraphic area, the following occurs, depending on the content of the :link. tag:

• Another window of the same library is displayed.
  
• Another window of a different library is displayed.
  
• A footnote window is displayed.
  
• A message is sent to the application program.
  
• Another application is started.