Is there an app that allows me to know if someone turns my PC on?

I want to know if someone is using my PC when I'm not home and I thought that posibly there's an app that links to a software in my PC and notifies me when someone starts up my compurer. I know I can install a program that keeps logs of the use of the compurer, but I'm searching for something that... show more I want to know if someone is using my PC when I'm not home and I thought that posibly there's an app that links to a software in my PC and notifies me when someone starts up my compurer. I know I can install a program that keeps logs of the use of the compurer, but I'm searching for something that notifies me in real time. Thanks!
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