one of the documented procedures in this installation of the ACS
ad_style_ec_user_string   { string "" }   { tagset "" }
What it does:
Proc generated by ad_register_styletag to support the ec_user_string ADP tag.
Defined in: /web/philip/tcl/ecommerce-styles.tcl

Source code:

    upvar db db
    upvar ec_user_string ec_user_string

    if { [info exists ec_user_string] } {
	return $ec_user_string
    } else {
	return "<blockquote>
<b>No user string.</b>
We can't find a user-specific string for this style template.
Please contact <a href=\"mailto:[ad_host_administrator]\">[ad_host_administrator]</a>