When you Log-off Bucket Explorer, all running processes are stopped automatically and whenever you run Bucket Explorer the next time and use
Process pending queue
option it starts from the previously stopped up record of process queue. In the direction column of each row of queue window, you can see the yellow colored downward arrow, green colored upward arrow or red colored cross for download, upload and delete respectively.
You can also add S3 file(s) in a queue to set them for future upload, download, and delete and afterward these queued files can be used to perform with their already set process by clicking on "Process queue" button of pending queue panel.
After completion of the entire queued processes of queue panel, you can see your Successful / Failed / identical / Skipped operation status information using different tabs, and their number on statistics panel in queue. Transfer queue history can also be seen any time after completion of process.