Hidden windows?

One of my tools (Macro Express Pro) has the facility to list all open
windows, in two categories: Normal and Hidden.

In the latter category I get a list of 211! Most look totally obscure
and seem to refer to folders or processes I haven't run for days or
weeks. There's even one called 'You are using a Pirated Licence Key',
which is worrying, as to the best of my knowledge I'm not!

I have another tool called Stiletto which also lists all windows, and
that shows 51 window names (most of them 'hidden'). That difference of
160 reinforces my suspicion that Macro Express is no cleaning out old
stuff.

The Macro Express developer (ISS) says that their list comes straight
from Windows. So, is there some XP tool I can use to get a definitive
'Windows' list please?

--
Terry, East Grinstead, UK