HP Compaq Presario,Presario 2100 Reference Manual page 50

Modem and Network Connections
Making Wireless Network Connections (select models only)
Turning off communication and ending a connection
1. Important: close any files that reside on other network notebooks.
2. To turn off the wireless 802.11 communication without turning off the notebook,
press the wireless on-off button. This also turns off Bluetooth communication if it
was enabled.
–or–
Right-click the wireless network connection icon in the taskbar and select
Disable.
Suspending or shutting down the notebook also turns off the wireless function.
42 Reference Guide