Begin a new error
reporting environment by marking a new error reporting context and then resetting the
status argument to SAI__OK. If
EMS_BEGIN is called with the status argument set to an
error value, a check is made to determine if there are any messages pending output in
the current context: if there are none, then an error report to this effect will be made on
behalf of the calling application.
CALL EMS_BEGIN( STATUS )
STATUS = INTEGER (Given and Returned)
The global status: set to SAI__OK on return.
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