Library /sys$common/syshlp/lse$menu.hlb DECW User Buffer Popup  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Use the user buffer pop-up menu to quickly access frequently used
  commands.  You can cut, copy, or paste text to and from the
  clipboard.   In addition, you can perform search operations with several
  different search commands, and you can save or close buffers.

  To access the user buffer pop-up menu, position the pointer within a user
  buffer and press MB3.