What solution is possible for remote monitoring of turning on and off the PC?

Question

Monitoring

Good evening!)
I am addressing a question to local specialists, I am sure that you will help)
I have 3 offline order acceptance points, employees start and end their shifts on their own. The control takes place in a banal way - in the morning a message is sent to the post office that they say "Oleg Yuryevich, here I am on a shift at Litovsky Val, etc."
Obviously, one of the employees made a mistake and sent a message with the signature of the mobile messenger Mail.ru!)))
What are the simple solutions so that I receive information at what time the employee turned on and off the computer, so I will track whether he opened the point on time. Information about what happens in the PC during the shift is not important to me. Well, I wish it was free.
The task is quite primitive, but no matter how much I google - everywhere I stumble upon large monitoring systems, the functionality of which I do not need at all.
Thanks!))

Answer 1

In the autorun or in the local policy on the events of turning on / off the PC, register the script for sending a letter via the command line. For example, through telnet or some other utility, there are many examples on the Internet.

Answer 2

Yes, it's trite to parse the system logs for switching on and off, and send a weekly report.
It is possible to do this from the console, that is, you can easily write a script and automate.
You can add a script to autostart that will send a letter of inclusion.