HP z558 manual LED Activity indicator light. The LED tells you that, Center, Acts as the Enter key

16	LED — Activity indicator light. The LED tells you that the
	remote control is emitting a signal when you press a button.
17	TV — Opens the My TV window in Media Center.
18	Pictures — Opens the My Pictures window in Media Center.
19	Videos — Opens the My Videos window in Media
	Center.
20	Play — Plays the selected media.
21	Stop — Stops the media currently playing.
22	Fwd — Moves media forward at three speeds.
23	Skip — Moves media forward 30 seconds in videos and
	live TV, one music track, or one DVD chapter.
24	i (More information) — Displays available information
	about a selected media file and displays other menus.
25	OK — Selects the desired action or window option and
	acts as the Enter key.
26	CH/PG up (+) and down (–) — Change the TV
	channels or move pages up and down, depending on
	available options. Move to the next DVD chapter.
27	Mute — Turns computer sound off. The word Mute is
	displayed when Mute is turned on.
28	Recorded TV — Opens the Recorded TV window where
	recorded TV programs are listed.
29	0 to 9, #, * — Change channels or enter text into a
	Media Center search or text box. Each time you press a
	number button, a different character appears. Press the
	Enter button to select a character.
30	Enter — Selects the desired action, menu, or window
	option.
31	Print — Prints your pictures that you select from the
	My Pictures window of Media Center.

Using the Remote Control

Using the Remote Control 17