A remote function call (RFC) is the call of a remote-enabled function module (RFM) in a partner system. The caller is the RFC client and the called partner is the RFC server. Information about the server is stored on the client side in table RFCDES. RFC destinations are maintained in transaction SM59. The remote destination can be another application server in the same or a different R/3 System, an R/2 System, or a non-SAP system.