By renaming this file to "do_trace.txt", you can force RC-20 Retro Color (RC) to trace/log additional information about what it's doing. This is useful for the XLN developers to get more information when RC isn't working as expected. Next time DS is run, it will create a log text file in: Windows: My Documents\RC-20 Retro Color Logs\ OS X: /Users//Library/Logs/RC-20 Retro Color Logs/ There will be a red "..TRACING IS ON" text at the bottom of the RC interface to indicate this mode. Remember to restore the name back to "dont_trace.txt" (or simply trash the "do_trace.txt" file if both files exist), since it slows down a lot of things!