A function to get the kernel for a widget.
An additional function that determines whether the extender
is enabled. By default it is considered enabled if the application
active widget is contained in the tracker. If this is also
provided, the criterion is equivalent to
tracker.has(widget) && extender.isEnabled(widget)
A widget tracker for identifying the appropriate extender.
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Interface for a Kernel user to register itself with the IHelpMenu's semantic extension points.