link A connection between an element in a hypertext document, such as a word, a phrase, a symbol, or an image, and a different element in the document, another document, a file, or a script. 

automatic linking A Doc-O-Matic feature that automatically creates links from words or symbol names to topics the topic IDs of which are the same as the words or symbol names or can be associated with them. 

alias An alternative label for some object such as topics and link targets.