WampServer

I am attempting to go through and better understand WAMP in general (as I use it). First, I want to start with the A. That being said what layer in the OSI model would A be? My assumption is it is the session layer. Then, is there a good place to learn about apache? I tried finding lectures online, but most of them are very pragmatic and have a specefic utility (how to use a specefic aspect
Forum: WampServer English