How does MF INVOKE interface with windows?

Hi,

I'm using MF Dialog ListView control in windows 10 visual cobol 2.3.2. Through intelligent guesswork I've added: INVOKE my-listview-item-objref  "centered"  to the MF generated listview prog i.e. to centre a col rather than justify R/L. I'm enjoying getting to grips with objects and have some questions... 

1. Does MF invoke literally pass the message, "centered" to the object, or is some kind of translation going on?

2. Is there a list somewhere of other listview attributes I can change? And is this list somehow restricted/controlled by MF or do I have direct access to all aspects of the Window's objects? 

3. (Someone else asked this recently)... Is there a good summary somewhere of how windows objects work and how MF programmers can interact with them? My background is strong COBOL but not object oriented programming. I do though have some javascript experience. 

Many thanks,

Linden