I need some clarification regarding triggering mechanism between SAP system and EDI-Subsystem. After creation of the IDoc, <b>R/3</b> will put the same file in the operating system at a directory. Then how exactly the subsystem will be triggered. I have seen some documentaion which explains like through RFC/STARTRFC the subsystem will be triggered. In the same manner, In inbound how <b>R/3</b> will be triggered once if <b>substyem</b> got the IDoc.