Computers that are off line

I have been using TeamViewer for personal use for a few years now. So far I have never been accidentally flagged as using commercially . In an attempt to keep my account in good standing I would like to know if there is any way I can monitor when my different personal computers are off line or online from a TeamViewer perspective . 

If I'm at home on my main desktop PC I can see which of my computers are currently online and which ones are off line. I would like to write a program that maintains  a record of these conditions so I can see what's going on when I'm not on my home PC. 

Ive tried looking through the available log files but don't see anything there that enables me to determine these state changes. 

Are there any options to add connect and disconnect events to the TV log that I can search for?

thanks

Mike