what is Oroin core ?
It's the central components of the Solarwinds suite : things such as the web interface, the polling engine, the sql server back end, alerts, reports et al that the individual modules such as NPM and SAM work under.
A full breakdown can be found in the Core admin guide.
http://www.solarwinds.com/documentation/Orion/docs/OrionCoreAdministratorGuide.pdf
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