Sony PCWA-C500 - Manual (Page 46)

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Viewing detailed network information
You can use the Wireless Panel utility to view detailed information about
the network your computer is connected to.
Double-click the Received Signal Level indicator on the
taskbar.
The Wireless Panel main screen appears, indicating the status of the
network that your computer is connected to. For details on each item on the
main screen, see page 48.