[TYPO3] Searching website for content on 404

[Andreas Balzer]

Hi!
I would like to get the following:
Imagine you have the following pagetree:
DOMAIN A
|-Page1
||-SUBDOMAIN www
|||-Page1.2
||-Page2
|-SUBDOMAIN community
||-Page 3

Page 3 should open community.DOMAIN A/page1.0.html which is of course 
not possible, because Page1 is not a part of Subdomain community. So T3 
shows a 404. Now I would like T3 to look through DOMAIN A, whether 
there's a page called page1 and if yes, it should display the page as 
community.DOMAIN A/page1.0.html. Is this somehow possible?

Greetings
Andreas