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

  Sets the buffer's read/write state.

  The parameter value read_only prevents LSE from writing the contents
  of the current buffer to a file upon exiting LSE or compiling the
  contents of the buffer.