How does Kerberos domain authorization work at the application level?

Question

Windows

How does a desktop client-server application (server side) or Java container Tomcat (Servlet) get user data at the application level?
For example, the steps described for setting up a 1C server on Linux include:
1) generating keytab
C:\>ktpass -princ usr1cv81/[email protected] -mapuser usr1cv8 -pass pass1cv8 -out usr1cv81.keytab
2) setting /etc/ krb5.conf
...
Then the server, having received the token, sends it to the KDC for verification using the kerberos client.
As a result, we get just a value of type String?