3.2.5.2 Connection KeepAlive Timer
When this timer expires, the Web Services Management Protocol Extensions for Windows Vista client MUST check whether the SecondaryConnection value of the CimOperations entry is NULL. If not, the client MUST construct an EmptyXmlMessage with the following attributes:
Action: The value "http://schemas.microsoft.com/wbem/wsman/1/wsman/Keepalive".
ResourceURI: The value "http://schemas.microsoft.com/wbem/wsman/1/wsman/FullDuplex".
OperationID: Set to the OperationID value of the row corresponding to this operation in the CimOperations table.