I see a lot of the objects in the Excel Object Model have this 'Parent'
property.

I am only interested in retreiving the host Workbook for a worksheet, which
brought me to this article:
http://msdn2.microsoft.com/en-us/lib...et.parent.aspx

It worryingly states

"IF the current Worksheet has a parent, then name of the parent workbook is
displayed."

So, I guess my questions is

When would a worksheet not have a parent?