one of the documented procedures in this installation of the ACS
ug_header   page_title   db   group_id
What it does:
Header for group user pages. It needs group id in order to get the groups cascaded style sheet information.
Defined in: /web/philip/tcl/user-group-defs.tcl

Source code:

    set selection [ns_db 0or1row $db "
    select 1 from content_sections where scope='group' and group_id=$group_id and module_key='display'"]
    set css_enabled_p [ad_decode $selection "" 0 1]

    set scope group
    if { $css_enabled_p } {
	return "
	<LINK REL=stylesheet TYPE=\"text/css\" HREF=\"/display/get-simple-css.tcl?[export_url_vars scope group_id]\">
    } else {
	return [ad_header $page_title]