Questions (Applecare/displays etc)

1) So i'm buying a 20" display and wanted to know what cord will i be needing to connect it to my MBPro. and do i need to download some program so that I can have one application on the MBPro and and if I move the mouse to the side of the screen it jumps to the display where I could have another application open?

2) If I get applecare for my MBPro (im certainly getting it for the display) will it be voided since I have opened my computer up several times and moved things around and replaced a whole bezel myself.

thanks hope to hear back soon.

1) It comes with the cords you need, I am not sure about the second question.

2) Although it depends exactly what you did, I am fairly certain that tinkering with anything except the RAM or HDD voids AppleCare and the standard warranty.

alright i guess it'll be a better idea to ask an employee at Best Buy.
thanks man