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the input read to match a valid entry

(Info-tag-table-marker): Initialize to nil.
(Info-tag-table-buffer): New variable.
(Info-find-node): Don't switch buffers if already in Info mode.
Use Info-tag-table-buffer to support multiple Info buffers.
(Info-read-subfile): Don't switch to *info* buffer.
(Info-build-node-completions): Handle buffer local bindings for
Info-tag-table-marker.
(Info-search): Add a save-excursion.
(Info-mode): Make Info-tag-table-buffer buffer-local.
Make a different marker in Info-tag-table-marker for each buffer.
(Info-kill-buffer): New function, on kill-buffer-hook.

(Info-index-next): Fix error message.

completions list just once, case-insensitively.

(Info-search): Restore previous subfile correctly.

(Info-check-pointer): New function.
(Info-mode-menu): New menu.
(Info-menu-last-node): New variable.
(Info-menu-update): New function.
(Info-mode): Add `Info-menu-update' to `activate-menubar-hook'.

(Info-last-preorder): After we move down or to the prev,
move down again.

if it comes with a directory name.

argument RECUR to avoid infinite recursion on malformed nodes.

(Info-find-node): Make error messages consistent.
(Info-insert-dir): Fix error message.

dot only from non-empty suffixes.

Match any type of definition, not just Function and Command.
(Info-index-next): Use Info-find-index-name.
(Info-find-node, Info-index, Info-index-next): Use `...' in err msgs.

Compute EXT-LEFT after removing the dot from SUFFIX.

(Info-select-node): Use buffer-substring-no-properties.

(Info-fontify-node): Check for headings that are `underlined' with
characters on the following line.

(info-insert-file-contents): Use info-insert-file-contents-1
to set FULLNAME.  Use call-process-region to run the decode program.
(Info-find-node): Use info-insert-file-contents-1.
(info-insert-file-contents-1) [MSDOS]: Don't use the dot in SUFFIX
if FILENAME already has one.

and don't include .info as suffix.
(info-insert-file-contents-1): New function.
(info-insert-file-contents): Use info-insert-file-contents-1.

(Info-find-emacs-command-nodes): Look in those files, if appropriate.