Use Buffers and Panes
Keep notes.txt open. You will open another file without closing it, then
put both files on screen.
Open another file
Press C-x C-f, type todo.txt and press Enter. Type Check the forecast.
and save it with C-x C-s.
Both files now have live buffers: rev's in-memory copies of their text. Switching files does not close or save the other buffer.
Press C-x b, type notes.txt and press Enter to return to your notes.
A list appears as soon as you press C-x b; typing filters it. Up/Down selects
a candidate, Tab completes its name, and Enter opens it. The list also includes
terminal buffers, including terminals shown in the lower panel.
C-x C-b opens the detailed buffer inventory.
Show both files
Press C-x 3 to split the editing area into left and right panes. Both panes
initially show the same buffer.
Press C-x o to select the other pane. Use C-x b, enter todo.txt and press
Enter. You can now see the notes and reminder together.
The two panes contain the following text. This sketch labels each pane with its filename and omits gutters and status details:
notes.txt │ todo.txt
Pack the notebook. │ Check the forecast.
Bring a pencil. │
Edits belong to the buffer. If both panes show the same buffer, a change in one appears in the other, while each pane keeps its own cursor and scroll.
Return to one pane
Press C-x 1 to keep the selected pane. Both buffers remain open.
Return to notes.txt with C-x b.
For a top/bottom split, use C-x 2. To close a buffer, use C-x k and accept
its name; modified text prompts you to save, discard or cancel.
See Buffers, panes and saved files for the distinction between a view, live text and a file on disk.
Next: Search and Run Commands.