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The DHCP feature on your router will allocate each computer with an address like 192.168.1.123.
To find out the address in Windows XP, choose Start/Run and type 'command'. When the command shell appears, type:
ipconfig /all
The IP address for that PC is shown in the details that appear.
Apparently (although I can't confirm it at present) you can do the same in Windows Vista. Type 'cmd' in the Search Box under the Start Menu and press Ctrl + Shift + Enter in order to launch the command prompt administrative privileges.
As ghia says, to preview your site across the LAN, you need to use this address instead of localhost in mainfile.php (and wherever a path is specified in Xoops).
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