What you'll need to access Dwango. The clients come in two flavors (DOS and Win95). If possible, download the DOS client. Until the new Windows client comes out, this version of the client is not much good except for chatting and playing only a few games. The DOS client plays all games that are supported by Dwango..
Dwango Client for DOS ver 2.03
DWANGO Drivers
(if you need one you'll know it)