Internet connection redundancy

I need to setup internet redundancy in my server (Win XP) located in my office.

I'm thinking,
C1: One internet conn uses my Network card
C2: One uses Wifi via a USB wifi dongle
C3: One uses USB port from a USB broadband modem

My question is,

Say currently my app is using C1, then when C1 is down, how will my PC switch to the other available connections? Will they auto switch? If not, is there a software in the market (affordable or free) that can auto switch for me?

melwongAsked:
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Kamran ArshadConnect With a Mentor IT AssociateCommented:
Thanks for the update. Please read the below article;

http://technet.microsoft.com/en-us/library/cc779696.aspx
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Kamran ArshadIT AssociateCommented:
Hi,

You can set the metrics for each connection.

Go to

ControlPanel--->NetworkConnections--->Right click on connection and go to properties ---> Properties of TCP/IP--->Advanced---> Now uncheck the automatic metric and assign metrics for default connection and assign higher for the other connections.

Alternatively you can use a multi-WAN router and terminate all the connections on that router. It will automatically perform the load-balancing and fail-over. Below are good links of multi-wan routers;

www.peplink.com
www.edimax.us
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melwongAuthor Commented:
what does this metric means?
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