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What is an NMI and what can I use it for?

Solution Verified - Updated 2015-09-01T20:38:04+00:00 -

Issue

Often, the term NMI is used when dealing with system hangs and crashes, what does this term mean and how can we configure the kernel to make use of them?
What is an NMI?

Environment

Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 4
Red Hat Enterprise Linux 3 Update 3 and later

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