When a RAS client application starts a connection operation, the RasDial call receives an HRASCONN connection handle to identify the connection. If the returned handle is not NULL, the client must eventually call the RasHangUp function to end the connection. If an error occurs during the connection operation, the client must call RasHangUp even though the connection was never established.
The application that calls RasHangUp should not exit immediately, because the Remote Access Connection Manager needs time to properly terminate the connection. Instead, the application should wait until the RasGetConnectStatus function returns ERROR_INVALID_HANDLE, indicating that the connection has been deleted.
A RAS client application might need to end a connection even though it does not have the handle returned by RasDial. For example, the application that called RasDial might have exited once the connection was successfully established. In this case, the disconnecting application can use the RasEnumConnections function to get all the current connections. For each connection, RasEnumConnections returns a RASCONN structure containing the HRASCONN connection handle and the phonebook entry name or phone number specified when the connection operation was started. This information can be used to display a list of connections from which the user can select the connection to end.