15 Aug 2002 update
	- §3 : 	Addition about several controllers working into a same FIR.
	- §3 :	Correction of L7-Perf link

09 Mar 2003 update
	- §1 :	Image slightly modified.
		New remark (4).
		Previous remark (4) renamed as remark (5).
	- §2 :	Chapter rewrote with addition of sub-paragraphs a), b), c) and d).
	- §3 :	Minor changes (syntax, orthograph).
	- §4 :	Minor changes (syntax, orthograph).

10 Mar 2003 update
	- §2 :	Minor changes in the text (syntax, orthograph).
	- §4 : 	Addition of a remark about DEP control.

30 Mar 2003 update	
	- §3 :	Correction of a mistake about using XXXX_UP_CTR callsigns.