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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
tagged queueing
A method allowing a device or controller to
process commands received from a device driver out of order.
It requires that the device driver attaches a tag to each
command which the controller or device can later use to
identify the response to the command.
Tagged queueing can speed up processing considerably if a
controller serves devices of very different speeds, such as an
SCSI controller serving a mix of CD-ROMs and high-speed
disks. In such cases if a request to fetch data from the
CD-ROM is shortly followed by a request to read from the disk,
the controller doesn't have to wait for the CD-ROM to fetch
the data, it can instead instruct the disk to fetch the data
and return the value to the device driver, while the CD-ROM is
probably still seeking.
(1997-07-04)