Use Airport Extreme as an access point only

I'm pretty sure this is possible but since Apple is using a different type of setup software for this product than I'm used to it would be helpful to get some pointers on how to do this. I assume I need to turn off DHCP and perhaps give the unit a fixed IP address. My existing network is fully configured with internet access etc and I just need to add the APE. I would connect the base to the existing network using one of the ports and not the WAN port. From this point will the Apple configuration software running on a Windows 7 PC be able to see the unit? Considering the existing network will be running as address like 192.168.2.xxx I'm concerned about the ability to see the unit. Once I can connect then configuration should be fairly simple. It is the intial connection I'm concerned about.

QA AirPort Extreme Base Station

QA AirPort Extreme Base Station

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