HP Compaq NC4000 Hardware And Software Manual page 19

Component
2
Infrared port
3
Display release latch
*The antennae are available only on select models. The antennae are not
visible from the outside of the notebook. For optimal transmission, keep the
areas immediately around the antennae free from obstructions.
Hardware and Software Guide
Description
Provides wireless communication
between the notebook and an optional
IrDA-compliant device.
Opens the notebook.
Component ID
1–9