The screens themselves are just that - screens. Not any different than your computer of phone screen. They turn on and off.
What counts (what you need to learn) is operating the software behind them, and that can be somewhat generic (covers all such installations) but also not generic at all, down to the level of a specific installation in a specific airframe (unlikely but not impossible) depending on what goodies a particular customer orders.
Technically - IS&S builds that system; ABX installs it and provides the pilot training and manuals - for several million bucks per. I'd guess you should start by contacting ABX themselves, and see if they offer "open" training in any form, beyond that which is part of the purchase price and available only to customers' (or ABX's) own pilots.
In effect, it will amount to getting a "mini" type rating, covering the displays and how they interact with the parts of the 767 you already know and love.