Not for this trip, but the one before this in fall of 2016, I had just gotten to bed after a BFFs bachelorette party, and i was asleep on her couch when my alarm went off for our FP window book time. I got up and started booking from my phone. Simultaneously, DH was booking from the laptop at home, 3 hours away. Then, when we were planning to FP the MK parade and it was not an option (it had just recently apparently stopped being a FP choice), and so he called and was booking a different FP from his phone via the CM, while simultaneously booking from the laptop and my booking from my phone. It all went fine. The CM was slightly confused by the fact that our FPs kept switching and appearing and disappearing until DH explained that we were doing 3 things at once, LOL.