The best thing to do is to start up the stack and operator tracer. This will
dump to standard output precisely what is happening. You can also use the
. operator to print information onto standard output. You can turn on
the tracer by writing 1 to the _eq_trace system variable,
ie. 1>>_eq_trace. The tracer can be turned off by
writing 0 in the same way. Control of this variable
allows tracing to be turned on and off at selected points during processing.
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