some function definition about diap up

RasGetEntryProperties- This function retrieves the properties of a phone book entry.

RasSetEntryProperties- This function changes the connection information for an entry in the phone book or creates a new phone-book entry.

RasGetEntryDialParams-This function retrieves the connection information saved by the last successful call to the RasDial function for a specified phone book entry

RasDial-This function establishes a RAS connection between a RAS client and a RAS server. The connection data includes callback and user authentication information.

RasHangUp-This function terminates a remote access connection. The connection is specified with a RAS connection handle. RasHangUp releases all RASAPI32.DLL resources associated with the handle.