The LINGO editor in Windows is "syntax aware." In other words, when it encounters LINGO keywords it displays them in blue. Comments are displayed in green, and all remaining text is displayed in black. The SCLRDL parameter sets the number of seconds LINGO waits after the last keystroke was typed before recoloring modified text. Users on slower machines may want to set this higher to avoid having syntax coloring interfere with typing. Users on faster machine may want to decrease this value, so text is recolored more quickly. The default is 0 seconds (i.e., LINGO recolors modified text immediately).