The unit has built-in Wi-Fi functionality, which allows communications with a standard access point to access the Internet, and with other DS units through a modified WiFi protocol created by Nintendo and partially secured using RSA security signing. The latter is used by the built-in wireless drawing and chat program, by games in non-online multiplayer mode, and to download game demos or multiplayer game software (used for DS Download Stations and multiplayer gaming with only one game card). The Internet capability is used to access the Nintendo Wi-Fi Connection, where users can compete with other users playing the same Wi-Fi compatible game and access other services.