PID (Process IDentifier) is the number that identifies a process running on a operational system.

learn more… | top users | synonyms

12
votes
4answers
44k views

PID:4 using Port 80

I was trying to install Zend Server CE on my computer but when I got to the point were I need to choose the port for my Web Server it says: "Web Server Port: 80 Occupied". So I decided to check what ...