Attention processing for IPCS subcommands and CLISTs

For subcommands and CLISTs running in IPCS line mode, IPCS displays the following message:
```
IPCS*
```
For subcommands and CLISTs running in the IPCS dialog, IPCS displays the following message:
```
Processing suspended--Enter a null line, TIME, END, or ABEND
```

You can do the following in response to either attention message:

Resume processing by entering a null line after the attention interrupt. If you are using session manager support at your terminal, press the ERASE EOF key and then press Enter to enter a null line.
Enter the TSO/E TIME command. The command runs without ending the interrupted processing and the attention interrupt remains in effect.
Enter the TSO/E ABEND command. The IPCS session abnormally ends with an IPCS user code of X'072' (decimal 114). The abend produces a dump if you have a SYSABEND, SYSUDUMP, or SYSMDUMP data set allocated to your session.
Enter the TSO/E END command. IPCS ends the interrupted processing.
Perform other processing by entering any other TSO/E command or an IPCS subcommand or CLIST. This causes IPCS to end the interrupted processing and run the new command, subcommand, or CLIST.

If you interrupt and end a subcommand that modifies the problem directory or the data set directory, the modification to the directory might be incomplete.

The ATTN statement of CLIST processing is not supported under IPCS. The scheduling of the attention interrupt causes the IPCS attention exit to be bypassed and control reverts to the terminal monitor program (TMP) level.