How did Kaspersky replicate UAC overlay on Windows XP? Here is the screenshot to what I relate to,
Upon encountering the overlay,
If you click outside the "attention" Window, system will beep and flicker the "Attention" window
All shortcuts, such as "Win+R", "Ctrl+Shift+Esc" or "Ctrl+Q" are disabled
(seemingly) the system won't process on doing anything until you "Continue" or "Cancel"
Here is how to replicate the behaviour,
Get a Windows XP VM
Download Kaspersky suite compatible with XP. I worked on the following version, download
Install the app onto XP VM.
[Possibly optional] After installation, request a trial licence
Go to Settings (bottom-right corner) -> General (first tab) -> Protection - Untick . You should get the same Windows as in the screenshot