2. Click the "Start Task Manager" pop-up window and click the "Check whether there is a port" column.
3. If there is no PID bar, check the left mouse button, find the selection bar, open the selection bar, check the PID and click OK to see the PID in the list.
4. You can see the description of the software and the port number of the process.
Relationship: the port must have process listening, and the process does not necessarily need to open the port.
Process: A process is a container for threads. Refers to the running program.
Port: a sign set by the network protocol to distinguish which application the transmitted data should be handed over to. The application receiving data listens to a set port, and then all datagrams sent to the port will be passed to the program. The port is just a two-byte unsigned integer with no physical or logical "interface".