Sony Multiscan CPD-1304S Service Manual page 48

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Note the following information regarding the overlay keys:
In order to exploit the screen in full, overlay buttons appear only when
needed for as short as possible. No overlay keys are displayed after starting
the device.
The first time the any of the (invisible) sensitive areas is operated this only
will awake and show the overlay keys, without processing them any further.
If no further action happened the overlay disappears after 30 seconds. If the
area is operated again while the overlay key is visible the corresponding
function is executed. If there are no more actions, the overlay keys will
disappear after 10 seconds. The invisible keys will execute the last shown
function for 20 more seconds. The overlay keys reappear if actions in this
time.
30 seconds after the last key operation, the procedure must be started from
the first be awakened again.
Because some displays are too long to be shown completely, a small yellow diamond on the
right side shows which part of the list is displayed. Using the overlay keys (arrow keys); you
can scroll through the list of displayed values.
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GasLab Q2 displays and operating the device
Figure 7.4: Overlay keys local and remote
G a s Q u a l i t y A n a l y z e r GasLab Q2