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If I have a router which is connected to three laptops and a server and there is no internet connection connected to that router then is it possible to still connect within that network of the three laptops and the server?

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up vote 2 down vote accepted

Quite simply, yes. You can connect to any service thats running on any of the systems, either through an ip address, or an internal domain name with a suitable server available - either on your router, or on your server with your clients set up to use it as a DNS.

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