Although new communication protocols such as HTTP, HTTPS, and SOAP have gained traction in recent years, remote function call (RFC) remains the most trusted and widely used for connecting ABAP systems. This is the second article in a two-part series that helps you create better performing and more robust ABAP applications using RFC. The first installment introduced key RFC concepts and discussed the five RFC types. This second installment explores more advanced topics. It shows you how to design and develop remote function modules (RFMs) that fulfill performance and security expectations, and how to properly maintain RFC destinations for effective network communication.