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remote function call
Call of a function module using the RFC interface Calls be made in the same system or from another system. The target system is identified using an RFC destination. This could be a connection between different AS ABAPs or a connection between an AS ABAP and an external system. Specially programmed functions whose interface simulates a function module, are called in external systems instead of function modules. Function calls can be synchronous, asynchronous, or transactional.