Dcontroller1.ini and Dconsole1.ini

I am running my Domino server under the Java Domino Server Controller.

When I look in the data directory for my server, I see a dcontroller.ini and a dcontroller1.ini. Also, I see a dconsole.ini and a dconsole1.ini.

These all look identical. Why are the *1.ini files created? What function do they serve?

Thanks for any input.