* The "-in-new-screen" commands have been replaced with

* The "-in-new-screen" commands have been replaced with
  "-other-screen" commands.  This is more analogous to the
  "-other-window" commands.

* New editor variable `use-multiple-screens', if set true, causes
  various window commands to use multiple screens instead of multiple
  windows.  Affected commands include C-x o, C-M-v, C-x 4, and
  commands that pop-up buffers.  This needs more work but is an
  interesting first cut.

* With multiple X screens, the selected screen is distinguished by
  having a cursor -- a screen's cursor is erased when it is
  deselected.  This is desirable because it is no longer the case that
  the selected screen and the focus screen are always the same.

* Modeline formats have been extended to allow procedures as elements.
  Such a procedure is called with the modeline's window as an
  argument, and is expected to produce another modeline-format element
  which is used in its place.

* Selecting a window in a screen other than the selected screen will
  also select that screen.

* New procedure `other-screen' will choose a different screen if one
  is available.

* New screen operations `screen-scroll-lines-down!' and
  `screen-scroll-lines-up!' return a flag saying whether they
  performed the scrolling.  Redisplay code tries to use them when it
  scrolls, and repaints if they don't work.  Currently these
  operations are implemented for X screens but not for curses.

* The `screen-write-substrings!' operation is now written in terms of
  the `screen-write-substring!' operation, so that it need not be
  implemented separately for each screen abstraction.

* The display-type abstraction has been redesigned so that it has no
  internal state -- the current display type is now part of the editor
  structure.  Most of the operations have been renamed.  The procedure
  `editor-display-type' has been eliminated, the procedure
  `editor-display-types' now returns display-type objects rather than
  their names.

* Each display-type now indicates whether it supports multiple
  screens.  This information is returned by procedure
  `multiple-screens?'.

* The buffer that appears in the typein window when no typein is
  occurring is now different than the level-0 typein buffer.  This
  means that, under normal circumstances, only one typein window shows
  the typein buffer when typein is occurring.  The previous method of
  obscuring the typein buffer with an override message on non-selected
  screens is no longer used.

* The file "winmis" has been eliminated.

* The procedure `using-screen' has been eliminated.