Retina Display - How many ATD's connect? / Daisy Chaining ATD's

[Java Overlord]

I have two questions:

1) How many ATD's can I hook up to the newest version of the Macbook Pro Retina Display?

2) How am I supposed to Daisy Chain ATD's? Two jacks are on the end of each of the wires, one megasafe and the other thunderbolt. Do I just leave the megasafe one hanging? Because that seems unsafe. Is it possible to use a different cable, or am I supposed to hook the megasafe to one of the jacks on the ATD?

 

[T5BRICK]

I'm pretty sure you're limited to 2 displays chained together.

The extra MagSafe connectors can just hang there. If I recall correctly, Apple includes little plastic caps.

 

[Java Overlord]

I'm pretty sure you're limited to 2 displays chained together.

The extra MagSafe connectors can just hang there. If I recall correctly, Apple includes little plastic caps.

Does the limit of 2 still apply if my internal display is powered off? (like, if the laptop is closed?)