Details

On a multicore computer, the list typically includes as many local kernels as there are cores, up to a limit defined by license availability.
Additional configurations for kernels on remote machines can be made available with the Wolfram Lightweight Grid and the Cluster Integration Package.

Examples

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The default value of $DefaultKernels:

When no kernels are running, LaunchKernels uses this list as the default to launch kernels:

Kernels can be specified using URL syntax:

Kernels can be specified using KernelConfiguration:

Remember the current value of $DefaultKernels persistently between sessions:

In a new session, the value is restored:

Remove any persistent value:

In the next session, the value reverts to the default:

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