The short version is that if you create a derived work, you must allow access to the source of your derived work. If used AOLserver code and hacked it to specialize it somehow, then your hacks must be available. If your product only uses AOLserver as a program, and only interfaces with it through the network and via modules, then you do not have to provide the sources for the programs that organize AOLserver for you, nor for the modules.
Keep in mind that if you really did modify the AOLserver code and need to be able to distribute it, you can negotiate an alternative license with AOL, but they'd be under no obligation to make the alternative license free for you or your customers. (IANAL, of course)
