To install this package, run in Emacs:
M-x package-install RET other-frame-window RET
C-x 7 <command> causes a buffer displayed by <command> to appear in another window in the same frame; a window is created if necessary. C-x 9 <command> causes a buffer displayed by <command> to appear in another frame; a frame is created if necessary. C-x W moves the current buffer to another window in the same frame. C-x F moves the current buffer to another frame. In addition, C-x 7 and C-x 9 can be followed by these keys: 0 - deletes the current window. 1 - deletes the other windows/frames. 2 - shows another view of the current buffer in a new window/frame. a - creates a commit log entry for the current defun in another window/frame. b - switches to another buffer in another window/frame. d - start dired in another window/frame. f - find-file in another window/frame. m - compose mail in another window/frame. o - select another window/frame. r - find-file-read-only in another window/frame. To extend this list, add key bindings to ‘ofw-transient-map’.