Library /sys$common/syshlp/decw$dxmhelp_help.hlb Glossary, Go to  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  A Go To operation displays the selected topic in the
  current Help window, replacing the information about
  the previous topic.

  The Go To Topic item appears on the Help window View
  menu.

  Contrast Go To with Visit, in which the current window
  remains open and an additional window is opened to
  display the requested new topic.