Infrared Sensor
The infrared sensor lets you transfer files from your computer to another
Audio Connectors
Attach headphones or speakers to the 
connector.
Attach a microphone to the 
connector.
Modem Connector
To use your computer's internal modem, connect the telephone cable to the modem connector.
For information on using the modem, see the online modem documentation supplied with your computer.
Network Connector
To use your computer's integrated network adapter, use this connector to connect the computer to a network.