Different programs use different network connections

Is there a way to set different programs to use different network connections?
For example: IE uses LAN connection, and Firefox uses wireless connection.

I have seen a lot of posts online and people suggested changing default gateway or metric etc. This is not what I want because these will change the preferred connection for ALL programs. I don't want to change all of them. If this cannot be done in Windows natively, is there any software out there that can help achieving this?

Thank you!
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I really dont think you can, Unless the program can specify what network adapter it uses.   I know you can using metric but that is use the preferred network then timeout which you have said.   If in the example you are giving for IE7 and Firefox, could you build a a machine with 2 network cards and set it up with 2 proxy squid servers and set the lan connections as the two different proxy servers? This mixed with adding gateway and metric might do it for you.  Not exactly what your after but could work.

There may be a better way of doing it than my suggestion.

Hope this helps.

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No, not directly. The only way you could accomplish this would be to use VMWare or similar, and set up multiple virtual machines which use different NICs. Use Firefox on one and IE on the other.
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