ParameterKeys
List of possible session parameter keys to obtain the session parameters.
            
This key is used to get the full path for library, which implements 
            IGeometryFactory interface.
            
The duration of an execution covered by an  IExecutionSession
This key is used to get the Major version of Dynamo. The returned value
            is a number.
            
This key is used to get the Major version of Dynamo. The returned value
            is a number.
            
This key is used to get the number format used by Dynamo to format 
            the preview values. The returned value is string.
            
public ParameterKeys()