I have a Mac Pro with 27" monitor in my home office. It's set up on a standard sitting desk. I'd like to set up a separate standing desk in another part of the room. I considered getting an iMac for that desk, but then thought maybe I could just get a second monitor with an extension cable and a second keyboard and mouse/trackpad. I could set the 2nd monitor to mirror the first one. Is it possible to have two keyboards and two trackpads or mice attached/connected to the same computer at the same time? Is there any way to do this?