multiple domains pointing to one application

hi there

if you check these 2 sites out:

http://www.southendlocaljobs.co.uk/

and

http://www.chelmsfordlocaljobs.co.uk/

it looks to me like that is the same application that those 2 different domains points to, but pressumably the application is also passed a 'townid' so it knows what text variances to display.

this isnt my application but we have a need to do something similar.

we are running CF8 on windows sever (2003 i think).

is this something one handles in IIS? or via somesort of rule in application.cfm

does anyone know what is considered best practice with this?

what about duplicate content from google's perspective etc.

thanks very much indeed for any help you can offer.