Windows users who use the Installation EXE file can simply click on the Copernicus icon to launch.
If this isn't enough, Copernicus can be launched from the command line with the statement java -jar copernicus.jar or java -jar /path.to/copernicus.jar. With this knowledge it is possible to setup global scripts (eg. for linux in your /bin/ directory). In windows, assuming that the .jar file type is associated with Java (which it is by default) you can launch the .jar just as you would a normal file with an associated program like a Word Document.