win32com and name of com

[bli]

hi all
first post.
I am using python to connect to dll. I have read everything I can find
on com!#@!
and tried all variations of the name of the dll to use in the Dispatch.
I get a com error-(-2147...1005, 'Invalid class string',None,None)
Do I add .Application to the name? (eg 'XXXX Control
Library.Application')
Any help appreciated?!? How do I get the info?
I have tried the gencache lines suggested in the lit. maybe I use them
wrong.
(All authors are fairly sparse on the topic using Microsoft examples
that are more self evident.)
thanks muchly!