RFC to File ...

I am send from File adapter(Sender) to RFC adapter(Receiver).

But i do not back RFC adapter(Sender) to File adapter(Receiver)..

i read /people/michal.krawczyk2/blog/2005/03/29/configuring-the-sender-rfc-adapter--step-by-step

but i do not understand where create RFC destination (in my opinion in XI)?

necessary create program ID?

how get parameter in RFC(Sender)?

how run call posting in after a time, and on how call XI or R/3 system?

Regards Anvar.