Sony VGN-P11Z/G User Manual page 56

To communicate without an access point (ad-hoc)
!
You cannot select the 5 GHz band, which is used for the IEEE 802.11a standard, on ad-hoc networks.
The IEEE 802.11n draft standard, using the 2.4 GHz or 5 GHz band, is not available on ad-hoc networks.
1 Turn on the WIRELESS switch.
2 Click the button next to or above your desired wireless option(s) in the VAIO Smart Network window.
Make sure the WIRELESS indicator light turns on.
3 Click Start and Control Panel.
4 Click View network status and tasks under Network and Internet.
5 Click Set up a connection or network in the left pane.
The Set up a connection or network window appears.
6 Select an option to specify the ad-hoc network settings and click Next.
7 Follow the on-screen instructions.
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Using Your VAIO Computer