The MQSetFloat64Property function sets an MQFloat64 property with the specified key to the specified value.
| MQSetFloat64Property
         (const MQPropertiesHandle propertiesHandle,
          ConstMQString key,
          MQFloat64 value); | 
MQStatus. See the MQStatusIsError() function for more information.
A handle to the properties object whose property value for the specified key you want to set.
The name of a property key. The library makes a copy of the property key.
The MQFloat64 property value.
MQ_HASH_VALUE_ALREADY_EXISTS