When set to zero, the SCROLL variable inhibits screen scrolling, except scrolling caused by explicit SCROLL phrases in ACCEPT and DISPLAY statements. If a line wraps on the bottom line of the screen, the screen will not be scrolled if SCROLL is set to zero, but the line wrapping will still occur; it will overwrite the bottom line. Normally, ACUCOBOL-GT will scroll the screen to bring a DISPLAY line onto the screen if its line number is past the bottom edge of the screen. When SCROLL is set to zero, this does not occur and the cursor location becomes undefined.