This option displays the contents of the QUSRSYS/IFORMNG output queue. The command WRKOUTQ QUSRSYS/IFORMNG is behind this option- unless InterForm400 is installed on the same machine, then the command APF3812/APFWRKOUTQ is used - with additional functionality compared to WRKOUTQ.
This can e.g. be used for verifying if InterFormNG has actually created a merged spooled file when testing.