SET(PAD_OVERSTRUCK_TABS)

    Determines what VAXTPU does when a user, working in a buffer whose text
    insertion mode is OVERSTRIKE, types one or more characters in the
    whitespace created by a tab.

 Syntax

    SET (PAD_OVERSTRUCK_TABS, {ON | OFF}

 Parameters

    ON                   In a buffer where the text insertion mode is
                         OVERSTRIKE, ON causes VAXTPU to preserve the
                         column positions of existing text when a user
                         enters text in the whitespace created by a tab.

    OFF                  In a buffer where the text insertion mode is
                         OVERSTRIKE, causes VAXTPU to convert from tabbed
                         space to blanks any whitespace to the left of the
                         inserted text, remove the tab, and replace it with
                         inserted text.  As a result, text to the right of
                         the tab often moves left when the tab is removed.