When you use google or yahoo search index pages
site:dmoz.com
you get results all URLs are related to dmoz.com

site:dmoz.org
you get results all URLs are related to dmoz.org

but when you click url: www.dmoz.com/Test/World/Corsu/
browser will show www.dmoz.org/Test/World/Corsu/
eg: all www.dmoz.com pages do redirect to www.dmoz.org
How dmoz redirect all dmoz.com pages to dmoz.org pages?
The important thing is: how both of dmoz.org and dmoz.com pages can be also indexed?

Thanks in advance.