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(elisp)Active Display Table

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Active Display Table
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   Each window can specify a display table, and so can each buffer.
When a buffer B is displayed in window W, display uses the display
table for window W if it has one; otherwise, the display table for
buffer B if it has one; otherwise, the standard display table if any.
The display table chosen is called the "active" display table.

 - Function: window-display-table window
     This function returns WINDOW's display table, or `nil' if WINDOW
     does not have an assigned display table.

 - Function: set-window-display-table window table
     This function sets the display table of WINDOW to TABLE.  The
     argument TABLE should be either a display table or `nil'.

 - Variable: buffer-display-table
     This variable is automatically buffer-local in all buffers; its
     value in a particular buffer specifies the display table for that
     buffer.  If it is `nil', that means the buffer does not have an
     assigned display table.

 - Variable: standard-display-table
     This variable's value is the default display table, used whenever a
     window has no display table and neither does the buffer displayed
     in that window.  This variable is `nil' by default.

   If there is no display table to use for a particular window--that is,
if the window specifies none, its buffer specifies none, and
`standard-display-table' is `nil'--then Emacs uses the usual display
conventions for all character codes in that window.  Note: Usual
Display.

   A number of functions for changing the standard display table are
defined in the library `disp-table'.