What is the unmarked trap-door underneath my laptop for?

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This is for MiniPCI cards and yours may contain: • Nothing • Modem • Modem + Network Although installation of the card is through a trap-door many device manufacturers only sell these cards to the laptop manufacturers directly or as build-to-order options. Intel and Xircom produce MiniPCI cards but these are OEM only. The enclosure allows you to install a modem card without opening the machine as it provides a 2-wire connection inside the trapdoor which is connecter to the centre two pins to the external modem connector on the left of the machine. To remove this blank plate push a paper-clip into the hole – it will pop right out. more
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