Usually it refers to Network Operating Systems. If that is not it check here...
http://www.computeruser.com/resources/dictionary/
I use this whenever I don't know what somethign is and it works ok.
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All truth passes through three stages:
First it is ridiculed
Second, it is violently opposed and
Third, it is accepted as self-evident.
ARTHUR SCHOPENHAUER (1788-1860)
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