Running an application with code coverage produces a .tcz report file. Enterprise Developer uses the information in this file to provide statistics in the Code Coverage view about what percentage of the code has been executed as well as to colorize the code in the editor to indicate covered (executed) and missed (not executed) blocks as well as covered and unexecuted programs.
From the Code Coverage view, you can navigate to the covered and missed blocks of code in the editor, import code coverage data from existing .tcz files or merge the report files produced from different runs of the application, and relaunch the application in code coverage mode.