1 licence per PC to run 1 CPU so if you want 2 then buy new licence to run other PC -- the retail box that MS put 32 and 64 that give you to choose which one to install not by 2 install at same time.
all Windows OS are only per PC with 1 product code key for check all hardwares before accept by activation. You can upgrade any new motherboard,etc.. and reactivation again as retail version can let you
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