Examples:
info show top-level dir menu
info info show the general manual for Info readers
info info-stnd show the manual specific to this Info program
info emacs start at emacs node from top-level dir
info emacs buffers select buffers menu entry in emacs manual
info emacs -n Files start at Files node within emacs manual
info '(emacs)Files' alternative way to start at Files node
info --show-options emacs start at node with emacs' command line options
info --subnodes -o out.txt emacs dump entire manual to out.txt
info -f ./foo.info show file ./foo.info, not searching dir