Not sure on the X-Bee wifi card specifically but other ones used connect to the router and in ARC you point it to the Wifi card (or via a virtual com port) in the connection control.

Thanks, that is good news.
Which other ones are you talking about? Could you provide a specific one that easily integrates with the EZB and performs the above?

Here's a Link to a WiFi product that works with the EZ=B board

Much obliged

Now class 1 Bluetooth UART modules are available and direct swap for the existing class 2 unit on the Ezb (rated at 30 ft). You could continue to use it with a direct connection through a class one USB dongle and they have a 300 ft range. No routers and no fiddling with IP addresses and such.

I have found these 2:
Which one would be an easy swap?

http://www.aliexpress.com/item/wholesale-hc-07-HC-07-Wireless-Bluetooth-to-UART-converter-RS232-TTL-COM-serial-port-slave/691512334.html

http://www.aliexpress.com/store/product/HC-07-Wireless-Serial-4-Pin-Bluetooth-RF-Transceiver-Module-RS232-TTL-New-for-Arduino-Free/110055_748077562.html

Would you recommend another model?

Both of those devices are class 2 and will only work for about 30 feet (on a good day). You will want a Class 1 Bluetooth device like THIS CLASS 1 that will work up to 300 feet.

Also when installing a class 1 bluetooth device to the EZ-Board you should also install a class 1 bluetooth dongle in your computer. You can search ebay and Amazon.com for choices of class 1 USB Bluetooth dongles.

Here's a class 1 dongle I have

Silly me... correct.. that is class2.
The class1 is priced too high... rather go with the WIFI.

No my friend , this dongle is 7 dollars on ebay

https://www.sparkfun.com/products/10268

64.99

Its about 10 dollars more than a WiFi module but much easier to use. Only use WiFi if you need networking and are OK with using a router. Its more difficult.