Sender and Receiver Idoc

Hi All,

what are the settings need to be done on both XI system and SAP R/3 system while XI system is communicating to any SAP R/3 system through an IDOC on any side sender or receiver.

Will there be any difference in the settings for sender and receiver SAP R/3 systems.

Could any body please suggest me some blogs or documents.

Thanks in advance..

Regards,

Radhika.