This is just a curiosity: what is that slim black part (see picture) in the Apple Macbook Air 1,1 (Early 2008) case?
2 Answers
According the Apple's user manual it is the Infrared Receiver.
http://manuals.info.apple.com/MANUALS/0/MA394/en_US/MacBook_Air_Users_Guide.pdf
The "Sleep Indicator Light" is next to it on the left.
The MacBook beneath it has the same configuration.
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1This is correct. It's only real use was with the Apple remote, for controlling iTunes and FrontRow. Jan 30, 2014 at 16:42