In Info mode, the following keys are mapped to the listed functions, but there is no description of the keys or what they do in either the Info summary or in the help for Info mode. Also, none of these functions are available from the Info menu in the menu bar.
1. . (period): 'beginning-of-buffer
2. e: 'end-of-buffer
3. ?: 'Info-summary
4. H: 'describe-mode
5. t: 'Info-top-node
The following keys are described in the Info summary, but are not listed in the Info menu on the menu bar:
h Invoke the Info tutorial.
RET Follow a node reference near point, like <mouse-2>.
m Pick menu item specified by name (or abbreviation).
d Go to the Info directory node.
TAB Move cursor to next cross-reference or menu item.
C-M-i Move cursor to previous cross-reference or menu item.
f Follow a cross reference. Reads name of reference.
S Search through this Info file for specified regexp case-sensitively.
This might be what is intended, or it might be an oversight that the maintainers want to correct.