You can browse all lines that have not been visited, or those that have.
 Query menu 
 choose Find unvisited lines...  
 displays the Unvisited Lines dialog 
The dialog displays a hierarchical view of the files, functions and lines.

In this colour scheme all lines will be shown in pink since they are all unvisited.
As with the other query dialogs, you can expand the search results, and double click the data items to edit source code in your preferred editor.
•Refresh 
 updates the list 
•Visited Lines 
 displays lines that have been visited  
 
All lines would then be shown in green or whatever colour you set.
•Unvisited Lines 
 lines that have not been visited