This is a LaunchDaemon configuration for Mac OS X for HansaWorld's HansaServer program, it's a proprietary bookkeeping program for Mac OS X that doesn't come with an init file.

To use it just drag net.aevar.HansaWorld.plist to /System/Library/LaunchDaemons/. Then use the Mac OS X launchctl program to load & start it:

# Loads the configuration
sudo launchctl load -w /System/Library/LaunchDaemons/net.aevar.HansaWorld.plist

This will automatically start the program, to check if it's really running:

# Check if the program is running
sudo launchctl list | grep HansaWorld
26     -       net.aevar.HansaWorld

Here you can see it's running as PID 26. It's also possible to check on it with ps:

ps -p 26
  PID TTY           TIME CMD
   26 ??         0:06.87 /Applications/HansaServer/HansaWorld

To stop/start it:

# stop
sudo launchctl stop net.aevar.HansaWorld

# start
sudo launchctl start net.aevar.HansaWorld

To see what's going on with the program:

# Check for HansaWorld in the system log
grep HansaWorld /var/log/system.log

Or follow the log in real-time:

# Will print new events from HansaWorld as they arrive
tail -f /var/log/system.log | grep HansaWorld