From:
http://www.eccorocks.com/features_functionality.htm
 
 
 
The .ECG file is used for synchronizing ecco data between Synchronized Ecco files.  If you put the ECG file on the internet you can synchronize your Ecco file from anywhere in the world!  I know this works, I use it all the time!  
 
 
(Roger Peters July 2002)