Difference between Call Transaction and Sesion Method in SAP ABAP?

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Differences between call transaction and session method.?

 1. In call transaction updating is immediate but in the session method updating is not immediate.

 2. In call transaction user has to handle errors but in the session method system has to handle the errors.

 3. In call transaction updating can be synchronous or asynchronous or local but in the session method updating process is by default synchronous.

 4. Call transaction returns sy-subrc value but the session method will not return sy-subrc value.

 In session method the data will be stored intermediately in sessions. After processing the sessions only then the data will be moved into data base. 

For processing the session the T-code is SM35.

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