Sony PCG-F520 - Manuel (Page 41)

Using Infrared Communication Devices !
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.