This product will give you complete control over who knows who is online. You can select usergroups and users whose online status is hidden from everyone, except members of usergroups and individual users from whom you decide no one will be hidden. When a user's online status is hidden, those from whom it is hidden will never see them shown as online in the "Cu ........

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Original Source: Miscellaneous Hacks - Hide Online Status of Usergroups/Users