Trigger Lines can be set to a non-negative numeric value.

   VALUE       : This value specifies the trigger-region that controls
                 how near the cursor is allowed to reach the top or bottom
                 border of the text area before scrolling begins.

                 The number given is one larger than the number of lines
                 to remain visible between cursor and window border. When
                 zero, the half-page jump incorporated in releases up
                 to 4.1 will be activated.

                 The maximum value allowed depends on the active font and
                 the size of the text area. It will always be one half
                 screen in characters.

   DEFAULT     : 2
                 TVini may overrule this.

MATRIX