Vassal is a game engine designed to be used for tabletop skirmish games. It is a general online system that has customized modules for hundreds of different skirmish type games. Dungeons and Dragons Miniatures is just one of them. To play DDM online you basically need three things:

1. Updated version of Java.

2. The Vassal game engine installed.

3. The downloaded DDM module.

Step One

Here is a link to installing Java and Vassal:

http://www.vassalengine.org/wiki/doku.php?id=getting_started:installation

Follow the directions closely.

Step Two

After that you'll need the latest DDM module. Here is the link:

http://www.vassalengine.org/community/index.php?option=com_vassal_modules&task=display&module_id=202&page=Files

You don't need the RPG module but you will need the extensions if you want to use any of the epic maps. So download the DDM_1-14-2.mod and the Extensions_1-14-2.zip and follow the instructions to place them into the proper folder.

Remember to follow the instructions closely. If you have any difficulties then feel free to ask me.