View under the computer win7 system

First of all, we have a taskbar under the computer. Find the task manager and open it.

After entering the task manager, select the third "service" option on the right in the menu bar above; You can view the total number of currently running processes in the following number of processes;

After entering the service option, you can see the name of the running program on the left and a PID on the right. This is the port number of the corresponding running program. Click PID to display port numbers in ascending or descending order for our observation.