IBM 950 User Manual page 72

Step 12. When you have encountered the problem with the line, click Stop trace
Step 13. A message indicates that trace data has been successfully stored with a
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from the Options menu.
You can check that the trace is producing data by selecting Display trace
parameters from the File menu. This displays the Trace Parameters
Display panel.
file name (for example, APC00001.APC). Record the name of the file and
click OK.