Reply: How to judge whether a computer is being monitored?

The most important thing is to find out which programs on the system are using some uncommon network ports to send and receive data. You can intercept them through the firewall that comes with the system, or you can intercept the network ports through the firewall function of some antivirus software.

The approximate steps are: set the firewall to "white list" mode, so that every time a program needs to send data to an external network, the firewall will prompt whether to allow a certain software to exchange network data, and then you can choose "yes" or "no".