Using Deep Freeze Configuration Administrator : Advanced Options Tab : Stealth Mode

Stealth Mode
Show Frozen icon in system tray - Select this option to display the icon to indicate that Deep Freeze is installed and the computer is Frozen.
Show Thawed icon in system tray - Select this option to display the icon to indicate that Deep Freeze is installed but the computer is Thawed.
If the options to show a Deep Freeze icon in the System Tray are unchecked, the keyboard shortcut CTRL+ALT+SHIFT+F6 must be used to access the logon dialog.