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Possible Duplicate:
Add extra parameters after permalink?

I need to add a slug to every post.

Current permalinks

http://www.my-domain.com/2012/01/01/my-post-title/ or
http://www.my-domain.com/my-post-title/

Rewritten permalinks

http://www.my-domain.com/2012/01/01/my-post-title/demo/ or
http://www.my-domain.com/my-post-title/demo/

Additional information

  • My demo-page should not return a 404-page.
  • I should be able to get the current ID of the post "my-post-title" from my demo-page.