Difference between value and value_in_use in sys.configurations

Hi, Was wondering of the difference between the columns 'value' and 'value_in_use' in sys.configurations. According to MSDN doc (http://msdn.microsoft.com/en-us/library/ms188345.aspx), 

'value' => Configured value for this option.

'value_in_use'=> Running value currently in effect for this option

But when I run the query

select * from sys.configurations

both the columns have the same value in all the rows.