Can I be on msn messenger on two mobile devices at same time?

[Warura]

I have a laptop, iphone and now a ipod touch for christmas. I currently move a lot and sometimes I am at messenger in home at my laptop, on the move on my iphone and in the gym i pretend to use the ipod. I currently know that you can be conected on the pc and iphone at the same time in msn messenger, but can I be conected to messenger on all three devices at the same time or will I have to log in in any third device I want to use??