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All groups start in an "everyone-can-see-everyone-else" environment. To change this, you can modify individual group visibility to determine which other groups a given group should be seeing on its contact list and vice versa. As soon as you check or uncheck a group inside the visibility page, connected Trillian clients will update accordingly and add or remove contacts to reflect your changes. There is no need to restart either the server or client after making visibility changes.