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

       /CONFIRM
       /NOCONFIRM

    Specifies whether you want to be prompted for confirmation before
    LSE performs a FETCH or RESERVE operation. The initial setting is
    /CONFIRM.