The Margin Warning option is used in conjunction with the Margin Distance option to warn the user either visually or aurally that the cursor is within a specified distance from the right margin. To set the margin warning:
If the Global Options dialog box is not displayed, choose Global from the Options menu.
Click the Margin Warning button in the Bell Control section.
Choose Enabled or Disabled.
Click OK at the bottom of the Global Options dialog box or press Return to save your selection and exit the window.
To save your selection and retain the window, click Apply.
Note that the Margin Distance option (see "To Set the Margin Distance") is inactive when Margin Warning is disabled.