I realize now that I'm not being very clear in what I'm asking. Here's what I want to do...
www.myserver.com/section/css/screen.css
should be processed by the template system. There
is a corresponding screen.tcl file that sets up the
data sources. In other words, screen.css should be
processed as if it was screen.adp
Yes, I could make a file called screen.adp and just ask for:
www.myserver.com/section/css/screen
but that's not what I want to do.