HP Pavilion dm4-1018tx Entertainment Notebook PC - Manual (Page 14)

Keys
Component Description
(1) esc key Displays system information when pressed in combination with
the
fn key.
(2) fn key Displays system information when pressed in combination with
the
esc key.
(3) Windows logo key Displays the Windows Start menu.
(4) Windows applications key Displays a shortcut menu for items beneath the pointer.
(5) Action keys Execute frequently used functions.
4 Chapter 1 Features