host-node-map is part of the acs-subsite package, which is part of oacs 4.5. I don't know of a comparable functionality in oacs 3.x, but if it is only the header and footer that you want to change then it should be quite easy to modify the ad_header and ad_footer procs (if you are not using the templating stuff) by adding a check for the value of [ns_conn host].
