Library /sys$common/syshlp/dbg$uihelp.hlb DEBUGUI, editor_replace_hlp  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Use the Replace with field to replace a specified string.

  After you enter the search string in the Find Text field and indicate a
  search direction, click the "Replace with" toggle button and enter the
  replacement string.  The editor replaces each instance of the search
  string with the replacement string.