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Following is a list of predefined user context properties that are maintained by the server.
| Property | Description |
| NSS_USER_AGENT | A String value describing the software used by the user to the server. It can be used to differentiate whether the connected user is Microsoft® Windows® Media Player or another server. |
| NSS_USER_IP_ADDRESS | A Long value containing the IP address of the user. The IP address often is not meaningful if it is masked by a firewall. The value of this property can change for different connections by the same client. |
| NSS_USER_CONTROL_PROTOCOL | A String value containing the protocol to communicate with the client. Valid types include: NSM, RTSP and Unknown. |
| NSS_USER_ID | A Long value containing the client identifier (ID). This ID corresponds with the ClientId property of the MediaServer Admin control, and it can be used to disconnect the client. |
| NSS_USER_NAME | A String value containing the user name. This property is only valid after the user has been successfully authenticated. |
| NSS_USER_AUTHENTICATOR | A pointer to the Iunknown interface of the authenticator object used to authenticate the user. |
| NSS_USER_GUID | A String value containing the client globally unique identifier (GUID). This GUID is generated when Windows Media Player is installed on the client computer.
The default value for RTSP clients (or any other client without an associated GUID) is "0." However, if the user-agent header in the original RTSP request contains "GUID=X," where X is a value, then X is the value returned. |