When an ethernet cable is not attached to the RJ45 network jack, the network LED's will indicate wireless network activity.  If the orange light is blinking when there is not an ethernet cable attached to the RJ45 network jack, then that means that the wireless adapter is passing traffic. The wireless card is under the keyboard but the antenna is routed up into the display.
I 'm dickering with a fellow about his Inspiron 2200 (Pentium M 1.7 GHz; 512 RAM; 60 Gb HD; Combo drive; XP Pro). He insists that there is no wireless antenna in the display; that there is no cable attached to the wireless card and that the wireless antenna is beneath the keyboard and inside the ethernet port. He points out that in wireless mode there is an orange light blinking in the ethernet port.  I've checked the service manuals for the 2200 and it shows an antenna cable in the display. Can someone throw some light on the subject? Is he right?  Thanks.  
Wireless antenna on Inspiron 2200