On the screen of VE console, "Send Ctrl+Alt+Del" button doesn't work in Internet Explorer.
IE debug console shows the following error upon pressing the button:
SCRIPT5007: Unable to get value of the property 'apply': object is null or undefined
Internet Explorer security setting prevent the button from operating correctly. The request to change the behavior is known under internal ID CCU-12341.
The VE console feature is going to be re-designed in the future releases of Operations Automation.
As a workaround, use Mozilla Firefox browser to access VE console.
Note: Google Chrome browser does not support Java applets at all.