Sony PCG-F570 Manual

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VAIO® Notebook User Guide
Using Infrared Communication Devices
Your computer includes an infrared port, located on the left side. You can 
use this port to communicate with other infrared-equipped devices with 
compatible protocols, such as a digital still camera or other computers.
To use infrared communication with another computer
Align the infrared ports on the two computers so that they are in a 
direct line.