Which user is necessary for a link between two Netmaster regions?

Document ID : KB000115439
Last Modified Date : 20/09/2018
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Question:
Which of the Background Users is necessary when a link between two Netmaster Regions is created?
Answer:
We assume that a Link is started between Regions AAAA and BBBB When you activate a link between two Netmaster Regions the activation of the link is indicated by these messages in Region BBBB: 

M N35008 LINK FROM AAAAAA TO BBBBBB STARTING. 
M N35002 LINK FROM AAAAAA TO BBBBBB NOW ACTIVE. 
M N20E05 APPC USER AAAABSYS LOGGED ON FROM AAAA -- AAAA Background 


So the BSYS Backgrounduser is needed for the link. This user is logged on at the remote system and therefore needs to be defined in the UAMS on system BBBB (if no genera UAMS is shared between the regions).
Additional Information:
When entering command SHOW USER you see the user from the other Region logged on (Here is is AAAABSYS on Region BBBB):

sh user 
N13509 USERID TERMINAL TYPE 
N13512 ------ -------- ---- 
N13510 .DFLTOP CONSOLE OPER 
N13510 BBBBAOMP BG-AOM AOMP 
N13510 BBBBBLOG BG-LOG BLOG 
N13510 BBBBBMON BG-MON BMON 
N13510 BBBBBSVR BG-SVR BSVR 
N13510 BBBBBSYS BG-SYS BSYS 
N13528 - APPC FROM *GLOBAL* 
N13510 BBBBLOGP LOG-PROC LOGP 
N13510 AAAABSYS CSNM39 APPC FROM *GLOBAL* 
N13510 USER1 NMNM0011 3270 
N13511 9 USERS LOGGED ON, 0 DISCONNECTED.