How do I connect my computer to a router for home networking without sharing the internet?

john b asked: Here is my setup:
1 Desktop Connected to local Comcast Broadband Cable
(has 2 NIC cards installed)
1 Lynksys wireless router connected to Qwest DSL
3 Laptops with wireless adapters
Here is my Problem:
I want to share all computers on a home network for filesharing only. The Desktop needs a dedicated Broadband connection. and the Wireless Router [...]

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