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

   /SENTINEL=("begin-delimiter","end-delimiter")

   Specifies a pair of strings used to delimit a section of text to
   be ignored during the comparison of result and benchmark files for
   noninteractive tests. The delimiters can be up to 256 characters
   per line, and must be unique. Any text between and including the
   delimiters is treated as if it did not exist.

   If you do not enclose the sentinel strings in quotation marks,
   they are converted to uppercase before the comparison of the
   files. Sentinel strings may contain any characters, but if you
   include spaces, tabs or commas, they must be enclosed in
   quotation marks.