ATTACC

The ATTACC parameter is not supported on an ISC session and causes session termination if sent.

The following table summarizes the source of the values placed in the ATTACH FM header fields.

Table 1. Source of values placed in the ATTACH FM header fields
Major field A1 B2 C3
ATTDPN4 PROCESS DPN  
ATTPRN RESOURCE PRN  
ATTRDPN RPROCESS RDPN  
ATTRPRN RRESOURCE RPRN  
ATTDQN QUEUE Message ID5  
ATTIU IUTUPE6 Paging6  
ATTDSP DATASTR7   COMPTn8
ATTDBA RECFM7   VLVB
      DPM-Bn9
Notes:
  1. CICS® EXEC BUILD/EXTRACT ATTACH.
  2. Set by IMS MFS; or, if MFS is not used, and the output is asynchronous unsolicited output, the RPRN defaults to the source LTERM name.
  3. IMS COMPTn in TERMINAL/NAME macros.
  4. For asynchronous processing, this field indicates SCHEDULER follows by containing the value X'02'. In this case, the remaining header fields are not contained in the ATTACH FM header, but are contained instead in the concatenated SCHEDULER FM header.
  5. Message ID for MFS demand paging.
  6. Value is set depending on MFS autopage.
  7. Second byte of these halfword binary fields is used.
  8. Components numbered 1 through 4.
  9. DPM-Bn permits MFS to be used. Using MFS MODE=STREAM on output changes the ATTDBA to chain mode; otherwise, IMS uses the default of VLVB.