How are vpn pptp accounts created?

Question

VPN

I often encounter such a thing as connecting via vpn like pptp, when they give the server address, username and password. After setting up such a connection, access to the necessary resources appears.
Those. somewhere on the server, some kind of routing to those resources is apparently configured. But here's where and how the accounts are created that allow you to walk along such a route.
In general, I would like to know how it is created?

Answer 1

https://www.google.com/search?newwindow=1&client=f...

Answer 2

Anywhere - local entries on the server, Radius authentication through data in the database\Active Directory, in text files, etc.