A superkey is defined in the relational model of database organization as a set of attributes of a relation variable for which it holds that in all relations assigned to that variable, there are no two distinct tuples (rows) that have the same values for the attributes in this set. Equivalently a superkey can also be defined as a set of attributes...
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http://en.wikipedia.org/wiki/Superkey
SuperKey, by Borland International, is a menu-driven, macro-generating program that includes a number of useful non-macro related utilities. For example, SuperKey offers vehicles for added security including methods of file encryption, a password-protected keyboard lock, and an instant screen-saving feature. SuperKey can be used to develop consiste...
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http://www.probertencyclopaedia.com/browse/GS.HTM
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