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wikipedia.org/wiki/Kernel_%28computing%29

A computer kernel is basically the "big brother" application and manages all other applications currently running on your computer, and controlling their access to cpu, ram, hard drive, and any devices currently connected (through device drivers of course).

There's never more than 1 kernel running on your computer at a time, however if you have multiple operating systems installed on your computer they each have their own kernel (windows vista, windows 7, windows xp, linux, mac, etc...).

If you install and run a virtual machine then another kernel will run in that and you could technically have multiple kernels running on your computer.

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