Canon EOS 350D Instruction Manual page 30

Basic Operation
Operating the <S> Cross Keys
The <S> key is mainly used for shooting-related settings and selecting
LCD monitor menu items.
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Press the <S> key
(1)
independently.
With the camera ready to shoot, you can
press any <S> key to quickly use the
key's respective menu function.
<WZ> ISO speed
<XB> White balance
<YQ> Metering mode
<ZE> AF mode
Press the <S> key to select the desired
setting, then press <0>.
Press a button, then press the
(2)
<S> key.
When the camera is ready to shoot and
you press a button, the button's function
remains on for 6 seconds (9). While
the function remains on, press the <S>
key while looking in the viewfinder or at
the LCD panel.
When the function timer ends or if you
press the shutter button halfway, the
camera will be ready to shoot.
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Use it to select the AF point.
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When using the LCD monitor (which
has no display timer), you can select
menu items or select images for
playback.