Chip-

Thanks for the response. The crucial question that I still
have is what happens when OnTime calls the procedure when
the user is working in another application. Will
ActiveWorkbook refer to the last workbook being used
before switching out of Excel or will it return null or
empty or something that will indicate that Excel does not
have the current focus?

Jack



-----Original Message-----
Jack,

ActiveWorkbook always refers to the workbook that is
active
regardless of whether it contains the running code.
ThisWorkbook
always refers to the workbook that contains the code,
regardless
of what workbook happens to be active. Therefore, you can
simply
compare the Name properties to see if ThisWorkbook is the
ActiveWorkbook. E.g.,

If ActiveWorkbook.Name = ThisWorkbook.Name Then
' active workbook contains the running code
Else
' active workbook does not contain running code
End If


--
Cordially,
Chip Pearson
Microsoft MVP - Excel
Pearson Software Consulting, LLC
www.cpearson.com