what is the importance of opnum parameter in invoke method.

Hi all, I have implement a remote stub class manually without generating it by 
rmic compiler, after then:

1. is it a legal process to generate stubs manually??
2. if so, is there any importance for the opnum parameter in the invoke 
method:
      
        invoke(Remote obj,
              Method method,
              Object[] params,
              long opnum)
              throws Exception

3. if i change this parameter and supply and random Long number!! what will 
be the effects?

Thank you very much.

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