It's possible.
The documentation that is installed on your system contains a tutorial on how to get it working.
The help file is located here:
"\Program Files\The Game Creators\Dark GDK\Documentation\Dark GDK.chm"
Click on search
Type in player, hit enter
Double click on the second "untitled" result that shows up.
It will contain a tutorial to learn the basics.
You should start with the LAN multi-player platform first, and learn how to pass the co-ordinates of players around, from there it's only as complex as you want to make it.
Most of all, have fun and search these forums for the cure to your headaches.
why doesn't it work the way I want it to!