File to Idoc Scenario and Idoc to File Scenario's

Hi Friends ,

This is Shalini Shah,

Please give me the details of how many busines sytems required in File to Idoc Scenario and Idoc to File sceanrio's.

In business system , what is the name of Integration server(this name is related to XI ot Third Party)

Please give me the full details of these two scenarios from Scratch.

Thanks in Advance.

Regards,

Shalini Shah.