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Difference between IDfMethod & IDmMethod

Greetings!

Can i know the difference between IDfMethod and IDmMethod. The reference manual have mentioned the use of these two inferface. However i would like to know the following things.

1. How is IDfMethod different from IDmMethod?

2. I want to write a Java Method to be written for deployment in Java Method Server. DCTM verson 6.5 SP1. Which interface will be an appropriate one?

3. Will there be any performance related issue if i use IDfMethod instead of IDmMethod for writing a java method?

4. Do you anticpiate any issue using either of the interface for writing a Java Method?

Thank you.