Info-menu is an interactive compiled Lisp function in `info.el'.

(Info-menu MENU-ITEM &optional FORK)

Go to the node pointed to by the menu item named (or abbreviated) MENU-ITEM.
The menu item should one of those listed in the current node's menu.
Completion is allowed, and the default menu item is the one point is on.
If FORK is non-nil (interactively with a prefix arg), show the node in
a new Info buffer. If FORK is a string, it is the name to use for the
new buffer.