Definition of a Security Principal

[Paul Brabban <darkphoenix2002 () yahoo co uk>]

All,

I'm looking for a definition of the term "Security Principal" - I 
understand what one is and I'm aware of the use of the term in Micro$oft 
products; I need to have a proper definition, assuming it's not an MS-
specific thing!

Can any of you security chaps and chapesses help me out?

Many Thanks

Paul

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