Forget RFID. Well, don't, but National Scientific Corporation has a prototype of a WiFi tagging system that, like RFID, lets you track things in real-time and space. The advantage that the WiFi Tracker system has over passive RFID tracking is that you can keep tabs on objects with WiFi Tracker tags (which can hold up to 256K of data) from as far as a few hundred meters away (the range of passive RFID taggers is just a few meters). While you can do something similar with active RFID tags, with WiFi Tracker companies can use their pre-existing WiFi network to track things rather than having to build a whole new RFID system.
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