Step 6:

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SLUECHO         APPL1             SLU-1          14564482 14564482 14564482  RECV  8000 080000    130   E2   LOGON     00        16
   RECV (DATA) REQUEST
       TH   2C0001010001          FID=2   WHOLE SEGMENT  NORMAL    FLOW  DAF=01   OAF=01   ODAI=0   SEQUENCE=1
       RH   0380A0   REQUEST         FM DATA          ONLY IN CHAIN   RESPONSE TYPE=DEF1   BEGIN BRACKET
                     INDICATORS=        CHANGE DIRECTION
       RU   F5C7114E 7F1DF8E6 C5D3C3D6 D4C540E3    D640C9E3 D7C5C3C8 D64B1D60 40C5D5E3   *5G.+".8WELCOME TO ITPECHO..- ENT*
 00000020   C5D97EC5 C3C8D640 4040C3D3 C5C1D97E    D9C5E2E3 D6D9C540 4040F57E E2E3D9C9   *ER=ECHO   CLEAR=RESTORE   5=STRI*
 00000040   D5C740D9 C5D7E340 4040F97E D9C5D7C5    C1E31150 50C5D5E3 C5D940C4 C1E3C140   *NG REPT   9=REPEAT.&&ENTER DATA *
 00000060   E3D640C5 C3C8D640 C2C5D3D6 E67A11D1    5F1D4013 115D7F1D F0                  *TO ECHO BELOW:.J–. ..)".0       *
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SLUECHO         APPL1             SLU-1          14564482 0002026  11000000  STRC  0004 081000     55   E2   LOGON     00        17
  ITP3514I PROGRAM=LOGECHO  STMT#=00008 PROCEDURE=LOGON   : ONIN  CONDITION MET; LOGGED_ON = ON
  ITP3514I PROGRAM=LOGECHO  STMT#=00012 PROCEDURE=LOGON   : ONIN  CONDITION MET; WAIT CONDITION SATISFIED
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SLUECHO         APPL1             SLU-1          14564483 14564483 14564480  XMIT  8000 880000      9   E2   LOGON     00        19
   XMIT RESPONSE
       TH   2C0001010001          FID=2   WHOLE SEGMENT  NORMAL    FLOW  DAF=01   OAF=01   ODAI=0   SEQUENCE=1
       RH   838000   RESPONSE        FM DATA          ONLY IN CHAIN   RESPONSE TYPE=DEF1
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SLUECHO         APPL1             SLU-1          14564530 0002026  11000000  STRC  0004 081000     22   E2   LOGON     00        20
  ITP3515I PROGRAM=LOGECHO  STMT#=00013 PROCEDURE=LOGON   : EXECUTION RESUMES
  ITP3512I PROGRAM=LOGECHO  STMT#=00011 PROCEDURE=LOGON   : DO WHILE CONDITION NOT MET
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Shortly, SLU receives a formatted 3270 data stream from ITPECHO. This contains the "WELCOME" screen SLU has been waiting for. The ONIN condition from statement 8 is finally met and "logged_on" is set to ON. The WAIT UNTIL ONIN condition from statement 12 is met (and would be met by any incoming message regardless of its content) and the WAIT condition is reset.

Execution resumes with the statement immediately following the WAIT, in this case, the END statement (13) and execution loops back to the DO WHILE statement (11). This time the DO WHILE condition "logged_on = off" is false and execution skips to the next statement after the DO WHILE group.