Forum:Logout of plus?

If I log on to my plus account on another device (say my IPad) will it log me out of the same account on my old device (say on my Ipod)? Will I not be able to play on my Ipod without a plus account if I already had a game using the account? I am okay if I can play with the internet still on but not backing up my old game.... I'm just not sure if once you log onto plus on any device with an active game if that account is always tied to that device and will try to always log in/ over write or restore..... Anyone have experience with this? Also, anyone know what happens to your game on the ipod if you delete your plus account? other than not backing up data anymore, will it totally screw up the app or delete the data saved on the IPod itself (assuming you always play connected to the internet and don't want to turn off wifi in order to play/ start up the game) Any help on the subject would be greatly appreciated as the people at plus are unhelpful and i got no response when I asked the question of deletion to nimblebits directly.....