• Go into the “Preferences” menu in ICQ and then “Internet Phone/Games/Chat.”
• Then click on “New External.” You’ll be given a box with three empty lines to fill in.
  • In the first line, type in the title of the application, i.e. “ZDoom.”
  • In the second line, type in the path to your zdoom.exe “C:\DOOM2\zdoom.exe” or whatever.
  • In the third line, type in the following: “-net 2 %i -extratic -dup 2 -deathmatch - nomonsters -skill 5 -warp 01 -nomusic” which will configure ZDoom to DM on Map 1 with the optimum TCP/IP deathmatch settings.
• Then click on the “Client/Server Application” button. This will bring up two additional lines to fill in.
  • In the fourth line, type the same thing as in line 2: “C:\DOOM2\zdoom.exe” or whatever.
  • In the fifth line, type “-net 1 %i -extratic -dup 2 - deathmatch -nomonsters -skill 5 -warp 01 -nomusic” which once again configures ZDoom for optimum Internet play. It’s exactly the same as line 3 except it has “-net 1” instead of “-net 2.”
• Once all this is typed in, press OK.

Then, if you want to DM a friend who has similarly enabled his ICQ, simply click on their name, click on “Internet Phone/Games,” and then on “ZDoom.” And away you go!