As soon as you enter text in the VLISP Console or text editor windows, VLISP attempts to determine if the entered word is a built-in AutoLISP function, a number, a string, or some other language element. VLISP assigns every type of element its own color. This helps you detect missing quotes or misspelled function names. The default color scheme is shown in the following table.
You can
change the default colors by choosing Tools 
Window Attributes Configure
Current from the VLISP menu. See Configure Current for
more information on setting colors.
The VLISP text editor provides color
coding for LISP files, DCL files, SQL files, and C++ language source
files (see LISP, FAS, and Other File Types for
a list of file types recognized by VLISP). VLISP uses the file name
extension to determine a file's type, and then selects the color
coding accordingly. You can change the color coding style associated
with a file type by choosing Tools Window Attributes Syntax
Coloring from the VLISP menu. All text entered in the Console window
is treated as AutoLISP code.