Organizations using applications they didn't build have to rely heavily on documentation, whether from an external vendor or written in-house. Vendor documentation, what the maker of the software thinks will be most helpful to the largest number of people, is hopefully good at answering "How." It might not be so great at answering "Why?" for your situation. But -- Surprise! -- lots of common server software doesn't have great documentation. Blogs and online forums may be what you have.