Minecraft: Two computers, same account?

Is it possible to install Minecraft on two different computers, with one version offline, and play at the same time? Would like to know if possible, if mojang account is the same?

Thanks, not vital to know, but would like to install on two different computers.

Yes! Its easy and you don't even need to go offline on any of them. You just need to log onto minecraft.net and download it like you did on the first computer. You just log onto minecraft with both of them. You can go on servers and everything, but if you try to go on the same server with the same account, then you won't be able to join as it will say:
'you are already logged onto this server!' but mojang won't do anything.