Described is a scrolling technology including a turbo-scroll mode that is automatically entered to increase the rate of scrolling through a set of items,. The infusion systems may include one or more fluid couplings used to make fluidic connection between a supply line and delivery tubing. The methods include performing an operation on at least one full-space rectangle on the workspace and redefining the first data structure and the second data structure in accordance with the workspace resulting from the operation performed.