The best replacement for product key is product id.

The best alternatives to product key are rated as following:
★★★★★  product id
★★★  activation key
★★★  license key
★★  serial number
★  cd key
★  2010 ultimate
★  2012 ultimate
★  coa

Your alternative for product key is not listed? Suggest!
Speaking about product key, one probably shouldn't forget about xp.

Other search terms related to product key and their ratings are:
★★★★★ xp
★★★★★ reinstall
★★★★ product id
★★★★ reinstalling
★★★★ microsoft
★★ sysprep
★★ reinstalling windows
★★ windows xp install discs
★ norton
sp2
You have in mind a companion for product key and it is not yet here? Propose!



Google Trends

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product key
product id
activation key