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Unlike most other caps, these caps are expected to directly control the feeder actions. E.g., for CAP_CLEARPAGE, the MSG_SET must be immediately mapped to a call in your scanner driver interface that ejects the current page.
The effectiveness of these caps depend a lot upon the scanner hardware/firmware design. Thus if a scanner is using internal memory buffers for ‘scanning ahead’, CAP_CLEARPAGE and CAP_FEEDPAGE become virtually useless.