[thelist] 2 Domain Names, 1 Host?

Howdy,
I know it is possible to have two domain names resolve to the same host.
However, I am wondering if it is possible to detect which URL a person is
coming from and redirect them to a certain page on that host.  For example,
I currently have a virtual host with the domain name
http://www.wiedersheim.com and I've acquired the name ClickTech.com.  If
someone wants to go to wiedersheim.com, I'd like them to go to
http://www.wiedersheim.com/index.html, if they want to go to
http://www.clicktech.com, I'd like them to be redirected to something like
http://www.wiedersheim.com/clicktech/index.html

Is that possible?  If so, any hints as to how?

Thanks a bunch.

Leo.
~
Leo P. Wiedersheim, Jr.
leo@wiedersheim.com
http://www.Wiedersheim.com
http://www.CampaignCollectibles.com