Library /sys$common/syshlp/lse$help.hlb SET_BUFFER_TEXT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Syntax:  SET BUFFER TEXT text_option

  Sets the text-entry mode of the current buffer to insert or
  overstrike.

  RELATED COMMANDS:

     SHOW BUFFER                 TOGGLE INSERT OVERSTRIKE