Once the X server is running, the Host control allows you to grant or restrict access to your X display. It also displays a list of hosts and users that have access to your current session.
To start the Host control, double-click on the Host icon in the Preferences Editor, located in the Controls window.
To grant access to your X server:
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To remove host access, select the host in the Access list, and click on Remove. To select more than one host, drag the cursor over the desired hosts and then click on Remove.
When you are finished, click on Apply. To exit, click on OK.
To restore your previous settings, click on Cancel.