Begins a highlight.
Any value, used to index the highlight
The data describing what to highlight and how.
host value is used for if multiple things require the same thing to be highlighted at the same time.
For example, consider if one thing wanted to highlight a menu bar button for 10 iterations, and something else wanted
to highlight the menu bar button for one. After that latter one finishes, if not for the system indexing by "host",
the highlight would end there and then, cancelling the remainder of the other highlight.
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