RCA D900 Manual page 16

MUTE Turns the TV's sound off. Press
MUTE again to restore the sound.
OFF/ON Turns off the current device (the
device you are controlling with the remote).
PREV CH (previous channel) Swaps the
current channel with the last channel you
tuned to.
SELECT/DISPLAY Selects a program in the
DSS program guide or a choice in a menu.
When viewing a program, it brings up a
channel marker providing detailed program
information. When previewing a coming
attraction or pay-per-view event, SELECT
provides purchase information.
TV Turns on the TV. Also puts the remote in
TV mode (the remote now controls the TV).
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