[gizdan]

I'm aware, but I thought iMessage had some hardware identifier that was necessary to use it. I guess my understanding was incorrect then!

[KarlKemp]

The identifier is part of it, as I remember from my mackintosh days, but it cannot be all: MacOS works well as a multi-user system, including separate iMessage accounts for each user.

[gizdan]

Aah, that's a good point.