Forbidding to close agent window

[Attila Horvath]

 Hi,
One of our biggest problem at checking state, when the user close the 
NAC agent window (with red X at window's upper corner).
In this case the checking procedure (which is about 2 min) is (re)start 
again.
Is it possible to disable it?
(I know I can disable the exit from the Cisco NAC Agent via the system 
tray icon, but it is different)

Thanks

Attila