How to play the NHCmod online tutorial - NHC Mod for Company of Heroes

How to play the NHCmod online
by AB2531

EDIT 11 February 2014:
For steam CoH Relaunch:
Make sure your maps are in the "relaunch" version of the same and when the game starts if you want to play with your friends, you now need to host a multiplayer rather than skirmish. Password protect the room and then only your friends can join. Have just been playing and all good.
If things do not work, try to run the game in Administrator mode

The following informations come from Forums.relicnews.com.
There is two ways to play a mod online:

1 First method
Each player need to have the same version of the mod and the patch 2.301
and you and your friends have to set the same model quality (high or low) in
parameters. You can use the shortcut of the NHCmod to launch the game.
GOOD: It is easy.
BAD: the -dev cause lag and more sync error. The players must have the
same version of the game: CoH or OF or CoH Gold.
ToV update:the person who wants to join must diseable all medals
after he joined the game he will be able activate them again

2 Second Method
Each player need to have the same version of the mod and the patch
2.301. Use the Mannerheim's launcher. It is the 'CoHLauncher.exe' which
is included with the installation of the NHCmod OF v1.3. It should be
in your CoH main folder. Each player have to start the game with the
'CoHLauncher.exe' and select the NHCOF.module. Note that your C:/ Documents
and Settings/(user)/ My Documents/ My Games/ Company of Heroes/ WW2/ Scenarios
folder has to be empty to run 'CoHLauncher.exe'.
GOOD: It is works with any version of the game. Less sync error. Sga maps
are showed correctly when they are installed with CoHLauncher.exe.
BAD: a little bit annoying to move the maps from C:/ Documents and Set-
tings/ (user)/ My Documents/ My Games/ Company of Heroes/ WW2/ Scenarios.