I would also add that "communication" is not necessarily part of the definition. There are many situations that require mobile computing, but don't require internet access.
Mobile Computing: Any situation involving the use of a portable computing device with a self-contained power supply.
@hellokitty[hk]
I couldn't Agree more, it becomes even more saddening when mobile technology is used to make an All-In-One PC, Like the Gateway One (Which I'm using).