What is the main diff between the IDOC, RFC,PROXY

HI,
May i know in witch situation we will go for : 1) Idoc
2) RFC
3) Proxy.
i hope we use above three are for posting data in R3 system.
can any one please clarify when exactly we use witch adapter.
regards

Hi
IDoc
It is used only for data transfer.It lies on ABAP Atack.also the underlying protocol is tRFC.
RFC
It is used when you need to process data and return values to remote system.That is it is used in synchronous scenarios.It lies on J2EE/Java Stack.It is not a data container like IDoc.It calls a functional module which gets executed.The underlying protocol is HTTP.Communication is done suing JCO/JCA.
Performance wise IDocs are better.
Proxies are used when large amount of data is involved.
Also go through this.
Choosing the Right Adapter.
/people/ravikumar.allampallam/blog/2005/08/14/choose-the-right-adapter-to-integrate-with-sap-systems
Thanks

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