If you call the file from your application, your developers will have to change their call. See http://www.grainge.org/pages/authoring/calling_webhelp/calling_webhelp.htm
If you call the page from another webpage, you can use ID-numbers, Topic-id's or filenames. You can find some more information on the page referenced above. You can however also use the following links:
For a filename: http://wnd=NewWindow - Note that this kind of URL will only work for Internet Explorer!
I'm linking from a little application that has been designed for us. For the most part, we are setting up the links, but the client also has the option to set up their own, so we don't want to complicate that end.
Thanks, Willam - this is a huge help!
Message was edited by: Captiv8r - Corrected spelling of Willam's name.