Duplication Of Lines On List Screens

On lengthy 'list' screens, more than one screen of information can be viewed by scrolling up and down through the list.

To help keep track of what the last line on the previous screen display was, the last line of the previous list display will always become the first line of the current display.

This is very important to know, particularly when manually calculating items from the list.  If line duplication is not known about, calculations will take into account the same line twice.