Question: what is IrDA? 

Answer: A suite of protocols for infrared (IR) exchange of data between two devices, up to 1 or 2 meters apart (20 to 30 cm for low-power devices). IrDA devices typically have throughput of up to either 115.2 Kbps or 4 Mbps. IrDA protocols are implemented in Symbian OS phones, many PDAs, printers and laptop computers. 2. The Infrared Data Association, the industry body that specifies IrDA protocols, originally founded by Hewlett-Packard and others.
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