Procedure to call an RFC from another R/3 system

Hi ,
I am new to RFC, how can we do the following steps:
1.      Run a routine in Dev environment which calls an RFC which is in testing
2.      The RFC performs the task as written  in it
3.      RFC passes the result to routine in Dev and
4.      We display the return in the end in Dev.
Do i need any authorization for that?
Regards,
Pooja

Hi,
I wanted to know how to call an RFC from one R/3 system to another R/3 system .
And what settings should be made to do a RFC in T code SM59?
what does the function module RFC_READ_REPORT do? Can i call any program through this?(As the documentation is not available I am not able to understand the functionality of this Function module)
Regards,
Pooja

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