Can anyone tell me the upgrade procedure for a 2 port to a 4 port Debut. I know The codes must come from comdial. What I need to know is there any other entrys besides the numlines.txt, and do you use the dos editor or what. I'm sure the upgrade will come with a instruction sheet I just want to know what I'm getting into. I could'nt find any usable info at the Comdial cust care center. Thanks in advance. John