[keycloak-user] Keycloak and 3 clients

Hi, I´m new to Keycloak and have the lucky possibility to play around with it here at my new company. Unlucky is I´m the only person who plays around with it at the moment. So I have to make it possible that we have 3 services connected with Keycloak. But just one of them should have the users in the same realm but the users shouldn´t be logged out. To recap: Keycloak with 3 clients, logout should log out only 2, but login should occur for all 3. Can you give me a gist how to solve that? Best regards Marc