Westgate and Boost control

[oreficeraffaele]

Dear friends,
i need to know the difference between "Max Westgate Duty # 1","Max Westgate Duty # 2","Max Westgate Duty # 3",and "Max Westgate Duty # 4".
And what is the difference detween "Boost Desired Engine Load #1","Boost Desired Engine Load #2","Boost Desired Engine Load #3" and "Boost Desired Engine Load #4"?

Thanks