If you are reading Info in Emacs, you can select a new independent Info buffer in a new Emacs window by typing M-n. The new buffer starts out as an exact copy of the old one, but you will be able to move independently between nodes in the two buffers. (In Info mode, M-n runs the Emacs command
In Emacs Info, you can also produce new Info buffers by giving a numeric prefix argument to the m and g commands. C-u m and C-u g go to a new node in exactly the same way that m and g do, but they do so in a new Info buffer which they select in another window.
Another way to produce new Info buffers in Emacs is to use a numeric prefix argument for the C-h i command (
info) which switches to the Info buffer with that number. Thus, C-u 2 C-h i switches to the buffer *info*<2>, creating it if necessary.
If you have created many Info buffers in Emacs, you might find it difficult to remember which buffer is showing which manual. You can use the command M-x info-display-manual to show an Info manual by name, reusing an existing buffer if there is one.