Calendar GetDayState

Hello,

I wonder which kind of event GetDayState is. I didn't use it until now and I need an explanation for localisation.
Can somebody help me? When this event is called? ???

Fred

http://msdn.microsoft.com/en-us/library/aa932377.aspx

The event isn't much use since it's not providing any mechanism for returning the information it wants.  I guess this was never completely implemented.