Is there any way to get a warning before the PC times out and goes into the lock screen?

[Donach (Student)]

Is there any way to get a warning before the PC times out and goes into the lock screen? When my TV or monitors are going to time out they give me a warning. It's very frustrating when I'm very involved in answering a maths question I have on the screen and suddenly it goes to the lock screen or screensaver. There doesn't seem to be a setting for what ought to be a simple piece of user-friendliness.

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