I can vouch for the effectiveness of the following process: 1. Click on the 'Results' window, 2. Click on the 'Current Session' text, 3. Right-click on the uppermost process (i.e. the one that is currently running) and select 'Cancel'. This should interupt all processes, unless there is a statement that catches errors, in which case you may have to repeat the process a few times.
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