The Register Idle Event Parameter (for Linux Clients)
NOTE: A similar parameter is also available for Windows Clients and macOS Clients.
If the Register IDLE event when user is inactive checkbox is selected (on the Editing Client / Editing Client Group page, on the Monitoring [Linux] tab, in the Monitoring Parameters section at the top) to enable this option, an idle event will be registered whenever there is no Client activity, i.e. no mouse movement or key pressing for longer than the Timeout (mins) value specified (where the default value is 15 minutes).
NOTE: This feature is only currently implemented for GUI sessions (in X Window System), and cannot therefore register idle events in local terminal or remote SSH sessions.