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Freebase(0.00 / 0 votes)Rate this definition: OSIsoft. OSIsoft, LLC is a worldwide manufacturer of Application software for real-time data infrastructure solutions, called the PI System. Founded in 1980, OSIsoft, LLC is privately held and headquartered in San Leandro, CA, with operations worldwide.
The OSI model is NOT important. It is obsolete. It teaches young children that the world should fit into a very particular mold, as conceived by stuffed shirt pie-in-the-sky dreamers. It has nothing to do with reality, as the real world decided that what they came up with was MUCH more complicated than necessary.