What is you forget your password, do you have to reinstall Windows to gain access to your desktop?
What happens if the program stops working for some error or a virus, does this lock out our desktop?

Look at info in the 3rd photo. You can always try a test run to be sure.

Lifetime, with no updates...correct?

If the rating system were less binary, I would give this a 4 out of 5 stars.

Pros: Fast and easy installation with a simple registration process; Generous license for personal use; Clean, modern interface with the option to scale; Easy-to-understand options, and options that make sense; Option to make the program play nicely and minimize to the system tray or close; Auto-lock by time countdown (idle time) or specified time; USB key; and more. Log file (with flexible settings) shows all activity including a screen grab of the mouse click that initiated an unlock attempt.

Cons: (1) There is no way to maximize the program window -- you can minimize to the taskbar and tray, but you cannot maximize it. This is just bizarre and doesn't work with my screen. Part of the window is always hidden by my taskbar. I could change my display settings, but not for just one program when all other programs work nicely. (2) If the Lock Options is set to transparent mode, the screen flashes blue before locking, and it's the horrible BSOD shade of blue -- not comfortable. (3) Also, if in transparent mode, if you click on the screen while it's locked, you're hit with a HUGE "locked" window. The person who clicked on your desktop can type you a message in this window, but don't we know what the message is? "Hey buddy, I tried to tinker with your machine while you weren't looking." Also, you can't unlock from this window. As it tells you, you have to close that window then right-click to enter your password. Even after unlocking, you get two more windows. As least one of these goes away on it's own, but regardless, transparent mode may be more in-your-face hassle than it's worth. I recommend using Windows lock mode to keep things more seamless and even stealthy. (4) Date & time formats are inconsistent. In settings, both 20:00 and 8:00 are used in the same line -- a mix of 12h and 24h. The log file is formatted as: "September 24 2022 9-19-36" -- which would be better read as "September 24, 2022 09:19:36" (5) The log file isn't very clear that there was a message left for you -- you have to really look carefully, then click the log line item. Easy fix: please make lines that include a message or image show a different icon so it's easily visible.

Nice program. Could use some tweaks. Keeper. Thank you for the chance to try this out.

What happens if the PC is turned off and then turned on again. Is it still locked?