RCA D900 Manual page 14

ALT AUD (alternate audio) Used to select
different audio options for a particular
program. Continue to press ALT AUD to
cycle through the available audio channels.
CHAN UP or CHAN DOWN (channel
up/down) Scans up and down the channels
programmed in the current channel list (like
using your regular TV remote). Also allows
you to page through the DSS Program Guide.
CLEAR Removes all on screen displays from
the TV screen. Any uncompleted display
screen is canceled and the previous setting
restored.
DSS Turns on the DSS Satellite Receiver and
puts the remote in DSS mode (the remote
now controls the DSS Satellite Receiver).
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