Using multiple different IP's on the same computer

I'm running 10.6, I figure you need to do something on the command line to do this...
Let's say that I have 3 connections coming into my computer - a WIFI, an ethernet, and a dial-up, and each has a unique IP.
How do I specify what application uses what IP? For example, let's say I want Safari to access the internet via the Airport IP, Firefox to access via the ethernet IP, and Opera to access via the dial-up IP.
Thank you for your help.

OK, so let me ask another question:
Here is my printout from ifconfig -a:
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
inet6 ::1 prefixlen 128
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
inet 127.0.0.1 netmask 0xff000000
gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
stf0: flags=0 mtu 1280
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet 192.168.2.1 netmask 0xffffff00 broadcast 192.168.2.255
inet6 fe80::21f:f3ff:fe4e:68f9%en0 prefixlen 64 scopeid 0x4
inet 192.168.1.103 netmask 0xffffff00 broadcast 192.168.1.255
ether 00:1f:f3:4e:68:f9
media: autoselect (100baseTX <half-duplex>) status: active
supported media: autoselect 10baseT/UTP <half-duplex> 10baseT/UTP <full-duplex> 10baseT/UTP <full-duplex,hw-loopback> 10baseT/UTP <full-duplex,flow-control> 100baseTX <half-duplex> 100baseTX <full-duplex> 100baseTX <full-duplex,hw-loopback> 100baseTX <full-duplex,flow-control> 1000baseT <full-duplex> 1000baseT <full-duplex,hw-loopback> 1000baseT <full-duplex,flow-control> none
en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet 192.168.1.100 netmask 0xffffff00 broadcast 192.168.1.255
ether 00:1f:5b:ca:24:fc
media: autoselect status: active
supported media: autoselect
fw0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 4078
lladdr 00:1f:5b:ff:fe:12:40:48
media: autoselect <full-duplex> status: inactive
supported media: autoselect <full-duplex>
en4: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
inet6 fe80::21c:42ff:fe00:8%en4 prefixlen 64 scopeid 0x7
inet 10.211.55.2 netmask 0xffffff00 broadcast 10.211.55.255
ether 00:1c:42:00:00:08
media: autoselect status: active
supported media: autoselect
en5: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
inet6 fe80::21c:42ff:fe00:9%en5 prefixlen 64 scopeid 0x8
inet 10.37.129.2 netmask 0xffffff00 broadcast 10.37.129.255
ether 00:1c:42:00:00:09
media: autoselect status: active
supported media: autoselect
en0 is ethernet and en1 is airport. So now, all my traffic will be going out through en0 because it's listed higher, correct? Now, if I go to my network control panel, go to set service order, and put airport (en1) higher than ethernet (en0) then all my traffic will go out through airport, correct? Now I did do that, and I typed ifconfig -a again, but the listing still showed the same, so do I need to restart to make the change effective or is there a command for the system to flush and change the order immediately?
And how do I check for sure on which interface my outbound traffic is going through?

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