The prefix key C-x 5 is analogous to C-x 4, with parallel subcommands. The difference is that C-x 5 commands create a new frame rather than just a new window in the selected frame (See section Displaying in Another Window). If an existing visible or iconified frame already displays the requested material, these commands use the existing frame, after raising or deiconifying as necessary.
The various C-x 5 commands differ in how they find or create the buffer to select:
find-file-other-frame. See section Visiting Files.
dired-other-frame. See section Dired, the Directory Editor.
mail-other-frame. It is the other-frame variant of C-x m. See section Sending Mail.
find-tag-other-frame, the multiple-frame variant of M-.. See section Tags Tables.
find-file-read-only-other-frame. See section Visiting Files.
You can control the appearance of new frames you create by setting the
frame parameters in
default-frame-alist. You can use the
initial-frame-alist to specify parameters that affect
only the initial frame. See section `Initial Parameters' in The Emacs Lisp Reference Manual, for more information.
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