Confusion about Configurations on File - XI - IDOC

Hi Experts,

I gone thru some blogs which was related to File to IDOC and IDOC to File and i checked the ALE configurations at both sides..

Still i have lots of confusions based on some threads...

for eg., for File - XI - IDOC

https://www.sdn.sap.com/irj/sdn/wiki?path=/display/profile/2007/05/11/fileToIDOC&

I have gone through this thread and i found, they haven't created RFC Destination and PORT at R/3 side. But, in XI side they created RFC Destination, Port and partnerprofiles..

So, finally could you pls conclude me the configurations about File to IDOC which is must necessary..

is it necessary to create RFC Destination and PORT while doing the scenarios like File to IDOC and IDOC to File.

Regards,

YRaj.