Frames

C-x 5 2 (which is bound to make-frame-command) will create a new frame. C-x 5 0 (which is bound to delete-frame) will delete the current frame if it is not the only one. C-x 5 1 (which is bound to delete-other-frames) will delete all other frames leaving only this one. C-x 5 o (which is bound to other-frame) will switch to another frame; pressing C-x 5 o repeatedly will cycle through all frames. These work the same as GNU Emacs.

C-x 5 f and C-x 5 C-f (which are both bound to find-file-other-frame) will visit a file in another frame. C-x 5 r (which is bound to find-file-read-only-other-frame) will visit a file read-only in another frame. C-x 5 b (which is bound to switch-to-buffer-other-frame) will switch to a buffer in another frame. These will always create a new frame; this is different than GNU Emacs.