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Yes, if you happen to own more than one device (e.g., an iPod touch as well as an iPhone), you're welcome to install the app on both devices. If you've upgraded to Pro, both devices access the one Pro account. Push syncing helps to keep the tasks on each device in sync; changes that you make to your Remember The Milk tasks on one device will sync up with the other devices so you're up-to-date.
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