one of the documented procedures in this installation of the ACS
rp_registered_proc_info_compare   info1   info2
What it does:
A comparison predicate for registered procedures, returning -1, 0, or 1 depending the relative sorted order of $info1 and $info2 in the procedure list. Items with longer paths come first.
Defined in: /web/philip/packages/acs-core/request-processor-procs.tcl

Source code:

    set info1_path [lindex $info1 1]
    set info2_path [lindex $info2 1]

    set info1_path_length [string length $info1_path]
    set info2_path_length [string length $info2_path]

    if { $info1_path_length < $info2_path_length } {
	return 1
    if { $info1_path_length > $info2_path_length } {
	return -1
    return 0