How to add authorized client to xhost?

Om a linux machine (In this case Debian), when I use the xhost command as follows: $ xhost + access control disabled, clients can connect from any host $ xhost - access control enabled, only authorized clients can connect When I do xhost - I observe authorized clients are allowed... Is there a way that I can add a authorised client? So that, even with xhost - specific clients/users can access the server.