How does your PC operating system know that a QQ program is running on your PC?
When a QQ program is running on your PC, the operating system utilizes system resources such as memory, CPU usage, and network activity to track its presence. The operating system maintains a list of currently running processes, which includes the QQ program. This list is constantly updated by the operating system to monitor the status of all active programs, including QQ. Additionally, the operating system may use inter-process communication mechanisms to detect and communicate with the QQ program.