I think I found a bug in the behaviour of an OSA ICC:

Experienced CMS programmers know that to start tracing a looping XEDIT macro
can be done by entering a TS command in the command area.  But, first one
needs to get the commandline.  A bit difficult as the 3270 is in "input
inhibited" (a green led on real 3277's, an X with the clock icon in the
status area nowadays) and the display is in fullscreen mode.

To get the command line, what is required depends on the terminal type
- a real non-SNA 3270: press the reset key (the stop input Inhibited) and
press enter, or PA1, ..
- in SNA: press the ATTN key then enter, or PA1, ...
- TN3270 with PCOMM: press ATTN

Today, on my PCOMM connected to an OSA ICC on a z10, I found no means to
break in (apart from "Communication" -> "Disconnect" or using some other
userid to send a CP Message/Warning to the user in trouble).  An OSA ICC is
supposed to simulate a non-SNA 3270, it does it well, except for this
problem.

Any comments?  Is it working on your system?

-- 
Kris Buelens,
IBM Belgium, VM customer support

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