Creating and assigning logical systems foe connecting BW to R/3

Hello ABAP Pundits,
I have to connect R/3 (sender) to BW (reciever). So I guess, I need to create logical systems in both BW and R/3.
So does this mean that I have to create two logical systems on R/3 and two logical systems on B/W ?
Do I need to do assignement of these newly created logical systems on both R/3 and BW separately ?
Pleae elaborate...
Regards,
Tushar.

I think the following documents should clear your doubts.
http://www.sappro.com/downloads/OneClientDistribution.pdf
http://www.sapgenie.com/sapgenie/docs/ale_scenario_development_procedure.doc
Regards,
Ravi
Note - Please mark all the helpful answers

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