Its a "port" or standard if you want to call it, to implement WIFI and Bluetooth in one assembly, with minimal RF interference, as the slot is on the display, not in the base.
If you didn't buy the Multiport Module when you bought your laptop (which costs around $150-200), then you would have a an empty cover on the slot. Fore more info:
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what is this? available in pakistan.??????
I certainly hope so!. I personally have no experience in laptops or its accessories, but your best shot would be to find a Laptop shop which has mainly Compaq/HP notebooks. Even if he doesn't have separate Module, he might give you from a Laptop. But make sure he doesn't charge too much. Ask for the model (Most probably would be W200), and then see its price range on internet, and pay according to that.