My perception of the view of the role of the CSD :

- To meet and greet passengers during boarding
- To individually welcome onboard any passenger in our First Class cabin and those holding a Premier or Gold Card from The Executive Club
- To be the main "middle-man" between the rest of the crew and the flight crew in the event of an emergency
- To operate the inflight entertainment system
- To co-ordinate the cabin in any emergency requiring drastic measures, including diversion, ditching or emergency landing

I'm not entirely sure that it's the job of the CSD to actually assist in any cabin onboard the aircraft, but you'll find that many do (usually in Club World during the hot meal distribution).

Well, maybe best we leave this for Purserette or Pucci but, like any other member of cabin crew, our true role is only really revealed under the most unfortunate of circumstances.