A CVS system that can automatically transfer updated file to htdocs
 

As a part of improving our development process we need a CVS system wherein any file that is updated in CVS automatically gets transferred to a corresponding directory within apache root directory htdocs. We dont want to use htdocs itself as the CVSROOT.

Can anybody suggest what's the best way to do the same? Any tool that you've used previously?

While this wouldn't be instant, you could have the system run a periodic (i.e., cron) cvs update from the htdocs directory... this would replicate your source there.

That's true! but I need something that's going to be instant. Has to be some modification in the source code of cvs.