Client Automation 14.5 CU1 or CU2
With CU1, CAF Reboot/Logoff dialogs will be displayed as Windows Toast notifications.
See this documentation for more details :
It is possible to disable Toast Notification by settings this on configuration policy applied on computers :
DSM/Common Components/CAF/General/CAF Dialog: Enable Toast Notifications = False
With this settings legacy dialog box (cfCafDialog.exe) will appear again