>I was passing in an object, oHandler, to another object, oxServer, but decided I want to create oHandler inside oxServer instead, to keep everything encapsulated so references are easier to make. What decides when to use NewObject, CreateObject or AddObject? I was using CreateObject for oHandler, then passing it in, but what's the correct way to do it inside oxServer? Why?

You can only add objects to some container (container class, form's class, page in pageframe, etc.). You can not add an object to a session based object.

So, this.oObject = createobject('myObject') would work almost for every object, while

this.AddObject('myName','myObject') would only work for objects that allow objects to be added, such as described above.