Sony FD Trinitron WEGA KD-34XBR960 Operating Instructions Manual page 43

Using the CONTROL S Feature
CONTROL S _llows you to control your system _r_d other So_y
equipment with one remote control. In _ddition to _llowing you to
control multiple devices with one remote control, the CONTROL S
fe_ature tallows you to always point your remote control at your TV,
instead of Mwing to point it _t the other equipment, which might be
hidden or out of direct line of sight.
Use CONTROL S IN to send signals to the TV.
Use CONTROL S OUT to send signals to connected equipment.