CRM 4.0 - IPC : Guidelines to start

Hi Experts,

Please could you guide me, how should i start <b>developement</b> with IPC?

System is CRM 4.0

What are all basic things should I aware of?

How much ABAP and JAVA knowledege is required?

Please guide me.

This will be really great help.

Regards,

N

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SAP Learner