1) What is the best way to call UpdateNotify()? I currently have one thread
dedicated to calling this method when data changes (it continually calls the
method every .1 seconds until Excel calls refresh data).
2) Is there a one to one mapping between an UpdateNotify call and a
subsequent RefreshData call? It seems that there are many UpdateNotify
calls that go 'unanswered' by excel.

Any help or information best practices for using the UpdateNotify() /
RefreshData() mechanism would be greatly appreciated.

Thanks in advance,

Ken Rangel