Boot Cache Update - what does it mean?

Not sure where to post this, but here goes...
I've noticed that Software Update sometimes gives a message of "installing boot caches" and I never gave it any thought until I was loading software for a Harmony Remote device and the Harmony software called for a similar message about updating or installing boot caches. What does that mean and WHY would a third-party software not related to the operating system update cause that? Should I be concerned?

No.

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Boot Cache Update - what does it mean?

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