Multiple network connections

On MacPro 3,1, have 2 ethernet connections plus Airport wireless.  Have iStat widget which shows only one with connection activity.  Can all three work simultaniously?  Sort of multiplex to increase bandwidth.
All three obviously have different IP addresses.  Can all connect to same site on differnt ports or something like that?  Or will they only connect to different site addresses, if that?

Matt Clifton-
You are quite right, but Apple did not put the proper emphasis on the Last Line of that article, which is the "tragic flaw" in this method.
LACP must be supported on all link aggregation devices involved.**
**Most consumer-grade Routers do not support LACP.
So this will not work for the vast majority of users. You Mac normally sends all Internet-bound traffic to ONLY the interface at the top of the list in:
System Preferences > Network
The second Ethernet port can be very useful in sharing your Ethernet connection with others without having to add another switch, or for Network-Attached Storage.

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     authentication port-control auto                                               
     authentication timer reauthenticate 4000                                       
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