The Pager and Classlist Tools both indicate who is currently logged in to ICON. If you don’t want to be interrupted by the Pager, you can appear to be offline, in which case people could still page you. Alternatively, you could turn your pager off, but you would have to remember to turn it back on when you're ready to accept pages. (See the Online Help section Avoiding Interruptions – Turn Pager Off or Appear to be Offline.)