How to generate IDOCs for HR Master data

Hi experts,

when we want to send any HR Master data to some third party system, do we ever use process code and its related function module to convert the application data into idoc file ? If tht is the case, I want to knw what is the selection program and posting program that are used for outbound and inbound HR idocs.

If not, what converts the application file to idoc file in HR ? In this process, is that mandatory to use change pointers also ?

Please clear this concept .. any kind of help is rewarded..

Thank you in advance.

Sirisha.