Software to control internet access from desktop computer

I have a customer who has a networked computer from which they would like to be able to control access to the internet via a password.  The computer needs to be able to access resources on their LAN and WAN without requiring a password, but they would like to prevent browsing of the internet by unauthorised persons.

I am looking for a software product I can install on this one machine (not all machines have internet access) that will prompt for a password when people try to browse to the internet.
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johnny_the_knifeAsked:
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nbowlingConnect With a Mentor Commented:
create a local user called internetuser ,set ntfs permissions to C:\Program Files\Internet Explorer\iexplore.exe so that only that user can run the exe , then create a shortcut

C:\WINDOWS\system32\runas.exe /user:internetuser "explorer C:\Program Files\Internet Explorer\iexplore.exe

put the shortcut on the desktop and make sure the user only uses that shortcut , they will then be propted for a password
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nbowlingCommented:
It sounds like you need a proxy server but it depends on how many users are on your network.
you could control the iexplorer.exe file using ntfs permissions or install some "free proxy server" software on a server on your network http://www.handcraftedsoftware.org/index.php?page=4&action=file&file_id=5
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johnny_the_knifeAuthor Commented:
Using a proxy server isn't an option on this network.  Only some machines have internet access (the others don't have any DNS configuration, the network is all peer to peer so it doesn't hurt anything), and we only need to control access from one machine.
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johnny_the_knifeAuthor Commented:
I have arranged with the customer to set this up during the week.  I will let you know how it goes.
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