| rdaClientInfo | Provides information on a client connected or wishing to connect to a device server |
| rdaDeviceServerBase | An abstract class that provides the RDA connectivity for device servers implemented as its derived classes |
| rdaIOPoint | Identifies the I/O value to be read, written or monitored in device access methods |
| rdaResult | Used to pass results of asynchronous device calls back to the calling client |
| rdaValueChangeListener | The listener interface for receiving notification of I/O value updates |