The input list is a numbered list of input rows, each of which has a checkbox associated with it. At the bottom are operation buttons; "+item", "copy", "del", and "clr" (not in picture above). Together with the check boxes these buttons handle common tasks for an input list.
"+item": This operation button handles adding and inserting the new "item" to the list. If a checkbox is marked for a row, it will insert the new item above the checked row. If no row boxes are checked, it will add an item to the end of the list.
"copy": This will copy checked rows, inserting them directly below.
"del": This will delete all rows that are checked.
"clr": This will delete all rows. Be careful with this.