set-window-buffer

set-window-buffer is a built-in function in `C source code'.

(set-window-buffer WINDOW BUFFER-OR-NAME &optional KEEP-MARGINS)

Make WINDOW display BUFFER-OR-NAME.
WINDOW must be a live window and defaults to the selected one.
BUFFER-OR-NAME must be a buffer or the name of an existing buffer.

Optional third argument KEEP-MARGINS non-nil means that WINDOW's current
display margins, fringe widths, and scroll bar settings are preserved;
the default is to reset these from the local settings for BUFFER-OR-NAME
or the frame defaults. Return nil.

This function throws an error when WINDOW is strongly dedicated to its
buffer (that is `window-dedicated-p' returns t for WINDOW) and does not
already display BUFFER-OR-NAME.

This function runs `window-scroll-functions' before running
`window-configuration-change-hook'.