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Actually it's so you can track multiple domain with one code. I do this with subdomains so that I can see all my traffic as well as by individual subdomain.

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Hello User #1122111, we see you are trying to track potatoes.example.com , would you like to show this?

Y/N

It probably doesn't come up all that often.

Great, which means most users will never see the message when someone adds their tracking code.

It doesn't happen that much, so "most users" is going to not be very many users.

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