What does the SPClientIDGenerator actually do?

I see this in master pages, but not entirely sure what it does and/or why it needs to be where. I've Googled this and got not a lot. Is there a quick, short answer to what this class does please?

Hi,
The only difference whether this control exists in the master page is that, if removing it from master page, the three JavaScript variables would not be created
after the site pages loaded:
As the information about this control seems not been documented well enough by Microsoft at this moment, I would suggest you submit a feedback to the Office Developer
Platform:
http://officespdev.uservoice.com/
Thanks 
Patrick Liang
TechNet Community Support
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact
[email protected]

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