Collaboration with Autocad

I work for an AE firm. My boss has sent me on a mission to find some software that we can use for collaboration on design projects so that people in our offices across the country can work on the same set of autocad drawings. I've seen some of the website hosting stuff out there, but does anyone know of any software you can buy to do this?
Thanks

 

[Briansch]

In an article in March 2002 Engineering Times, the author compared a couple of softwares that support collaboration and coordination. They were Bentley's ProjectWise (

http://www.bentley.com)

and Viecon (

http://www.viecon.com).

 

[Adrian2]

Dear Chris;

Last year our AutoCad VAR demonstrated something like this that Autodesk was just starting. I cant remember what its called. Resend your request to Drew Fulford at

http://www.mymcad.com

Regards Adrian