1. Download and install https://zandronum.com.
  2. Copy relevant doom .wad files to the Zandronum directory.
  3. Launch zandronum.exe from the command line with the relevant parameters.
C:\Zandronum\zandronum.exe -iwad doom.wad -host +cooperative 1

Zandronum Server

  1. Zandronum will create a .ini in the directory with the game settings that you can adjust manually if required. Other settings can be created from the server window.