To disconnect a user, first select the user name in the list above and then click this button. Not available because a connected user is not selected. To disconnect a user, first select the user name in the list above and then click this button. This is the name of your Macintosh. To change this name, use the Sharing Setup control panel. This lists all of the folders and disks on this computer that are shared for file sharing. This indicator shows the current level of file-sharing activity on this Macintosh.