The MAXScript Listener is a combination of text editor and command prompt window. MAXScript executes the commands you write when you press ENTER, but you can also scroll through the text to re-execute existing commands, or edit them and then have MAXScript execute the modified code.
A line selection margin at the left window border. When you move the cursor into the left margin, it changes to a right-pointing arrow. A single-click selects an entire line, and click-dragging selects multiple lines.
Color-coding for distinguishing between input text, output text, and error message text. Three MAXScript system global variables control these colors, and you can assign them new colors to customize your Listener.