I understand fluent does this in the background. But i want to know more about RP_NODE and RP_HOST i cannot find these commands anywhere in any general parallel programming textbooks.

As far as examples go how can i look for a specific command RP_HOST in a specific model example?

I see this on documentation but i cant find its corresponding case file to understand what is going on here 

where can i find a case file for this

Example: Global Summation of Pressure on a Face Zone and its Area Average Computation?