use System.exit() to force exit because RXTX spawns a non-daemon thread
darcs-hash:
20090128215205-5007d-
f2f8ecaa38c1575b5276380b8101bd19848f9fc5.gz
add a comment explaining a common failure mode
darcs-hash:
20090128215148-5007d-
67b505132c0f5a711e718743b61a473019238c85.gz