KF How to run multiple dedicated servers on one computer?

I know how to open a dedicated server, but I know to only open ONE . (I'm running Windows 8.1.)



I have a friend who can open MULTIPLE dedicated servers...but he won't tell me how!



For example, he has:

• Bob's Beginner Server #1


• Bob's Normal Server #1


• Bob's Normal Server #2


• Bob's Hard Server #1


• Bob's Hard Server #2


• Bob's Hard Server #3


• ...and so on, all on one computer

I Googled it, and a section in the wiki about it, but I have no idea what it's saying!



Can anyone give simpler instructions??



Please help!