You have obviously only just started to work with World software, so please do yourself a favor and read the Technical Foundation Manual. This describes in great detail all the basic architecture, infrastructure and concepts of the system, and would have answered that question easily for you.
Aside from that, is there nobody else in your work location that knows World? If I was an IT Manager I would be nervous knowing that the people working on my systems did not even know the basics or JDE or AS/400. If there are more knowledgeable people in your IT department, then basic questions like this ought to be answered by them. Online forums like this are normally (or at least they used to be) for more complex issues that cannot be easily answered in-house.
Sorry - just my 2cents for the morning......