What data does Google collect?

Question

Google

There are 2 computers in the local area network.
On 1 computer the user has Gmail mail.
On the 2nd computer, we went under the account to the mail of computer No. 1
Comrade (computer No. 1) received a message on the phone that there was an entrance to the mail.
What data does Google collect so that it determines that the input is from another device? Ip, hardware data, something else ....
I can not find the answer.

Answer 1

It also matters what browser you use, because Chrome also collects information.

A friend (computer No. 1) received a message on the phone that there was an entrance to the mail

Everything is very simple here. In the mail settings, you can configure security, if you uncheck certain checkboxes, then notifications will not come.
Another thing is that when you enter any site, various data about you can be collected and it is difficult to resist this.

Answer 2

Cook enough.
Just log in on the first computer, but from a different browser

Answer 3

How the Unique Browser ID is generated:
https://developers.google.com/analytics/devguides/...
https://stackoverflow.com/questions/216542/how-do-...
It's not about google. This can be done for any site.