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

  Syntax:  ENTER TAB

  Inserts indentation and moves to the current indentation level.

  This command inserts blanks and tabs to move the cursor to the
  current indentation level (if at the beginning of the line), or to
  move the cursor to the next tab stop.

  If the current indentation level is set to the beginning of the line
  and the cursor is at the beginning of the line, the ENTER TAB command
  inserts enough blank space to move the cursor to the first tab stop.