Configuring an Intranet?

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http://hardforum.com – My uncle asked me for help configuring an Intranet for his small business workgroup (6 PCs with Win7) all of which have Internet access, mostly like this: Internet router -> switch -> 6 Pcs. Right now, all the 6 PCs have Internet access and of course access to the company email (Bluehost) But he wants only 2 Pcs to have Internet access, and the remaining 4 access only to the company email (without being able to browse Internet) I have no idea about configuring an Intranet, any ideas of how-to guides? Maybe using the plugin at the hosting site (Bluehost)? Or maybe getting a new PC t (Hardware)