if you going to make reservation from privilege/complementary/duty pass in rajdhani/shatabdi/duronto/janshatabdi then ticket booked in dp(duty pass) quota instead of general quota
a railway employee/officer eligible for the above passes
privilege=for working employee/officer(also knows as suvidha )
complimentary=for retired employee/officer(also known as manarth)
duty...
more... passes=employee/officer going for some duty work