I have noticed that on a lot (all?) Airbus cockpits, there are these "things" (for lack of a better term) under the panel.
I have highlighted them in this picture of an A340 cockpit:
What are they?
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Since Airbus planes use a sidestick instead of the traditional center yoke, they use the space where the yoke would be to include a fold out table instead. You can see a laptop on one here. The A380 version also has a keyboard. This is used to interface with the onboard systems and input information.
Are you talking about this area?
This is a pull out keyboard, which is part of Electronic flight bag (EFB). It is part of a standard laptop computer. However, its integrated Keyboard Cursor Control Unit (KCCU) can interact with the cockpit screens. The full-size keyboard felt substantial and, in the paperless cockpit, will greatly ease the tasks of data and text entry.