/sys$common/syshlp/helplib.hlb SEARCH, Qualifiers, /WARNINGS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /WARNINGS (default)
       /NOWARNINGS

    Allows or disallows the following messages to be displayed when
    search operations are performed:

       NOMATCHES
       TRUNCATE
       NULLFILE