Library /sys$common/syshlp/edthelp.hlb CHANGE, ENTITIES, RANGE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 The range entities specify all text in the buffer either before or after
 the cursor.  The two range entities are:

     BR  Specifies the text from the cursor position to the beginning of
         the buffer.
     ER  Specifies the text from the cursor position to the end of the
         buffer.