Library /sys$common/syshlp/lse$clihelp.hlb ERASE, WORD, Qualifiers, /PREVIOUS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Erases the previous word when the cursor is on the first character
    of a word or between words. When the cursor is in the middle of
    a word, that entire word is erased and the cursor moves on to
    the first letter of the next word. You cannot use the /PREVIOUS
    qualifier with any other ERASE WORD qualifier.