I have an iMac and a Mac Pro, the latter is used when I travel. Do I have to buy TWO Lion OS? THEY BOTH HAVE SNOW LEOPARD 15.6. Thanks

I have both an iMac and a Mac Pro using Snow Leopart 15.6 as an OS. Do Ihave to buy TWO Lion OS to upgrade my OS'?

No. Open the App Store on one computer running Snow Leopard. Purchase and download Lion. On the other computer open the App Store, log on using the same Apple ID, re-download Lion at no extra charge.
Alternatively, see Burning A Lion Boot Disc

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