Sony VGN-S4HP/B User Manual page 50

Wireless LAN Channel Selection
In an 802.11b/g configuration, channel 1 to 13 can be used.
(a) With an Access Point ("Infrastructure")
The channel used will be the channel selected by the Access Point.
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For details on how to select the channel that will be used by the Access Point, see the access point manual.
(b) Without an Access Point ("ad-hoc")
If the Wireless connection is initiated by the VAIO computer, channel 11 will be selected.
!
In France, only certain channels are legally allowed when using WLAN outdoors. For more information, see the Wireless LAN Regulations.
If the Wireless connection is initiated by a peer Wireless LAN equipment, the Wireless LAN communication will make use of
the channel selected by the peer Wireless LAN equipment.
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Using Your VAIO Computer