In an example embodiment, there is disclosed an apparatus comprising a plurality of ports and routing logic coupled with the plurality of ports. The system manages three types of content: recorded content items, content items scheduled for recording, and content items that have not been recorded and are not scheduled for recording either. The pressure alteration section alters a pressure inside the droplet ejection head. Correlated intensities are grouped into a set of segments of a feature mask image. This invention takes the load off the surgeon and puts the load onto a mechanical device and places the surgeon into the best possible posture and comfort for which to conduct surgery and rest his own body while performing the surgery.