3 questions

LittleCVR

Sorry but I'm not very good at speaking English.

I spent some time reading articles in this board just a few moments ago.
But I still don't understand something.

First: Why are there two targets in any traffic rule? ???

See this:
http://forum.pfsense.org/index.php/topic,412.0.html
I had read this topic but it doesn't help much.
Besides, I don't think that the two targets have anything to do with something like ACK flag and ToS. :)
Am I wrong ???

Second: What is the exact meaning of "Bandwidth"?

See this:
http://forum.pfsense.org/index.php/topic,3050.0.html
In this topic dusan said that "Bandwidth" is just a shortcut for Linkshare curve's m2.
But many queues generated by EZ Shapre wizard which has 1% bandwidth could still exceeded that.
Why ???

And third: How to set link share?

I had read this:
http://wiki.pfsense.com/wikka.php?wakka=HFSCBandwidthShapingNotes
But it doesn't state very clearly, if I have two computers, say C1 and C2.
I create two queues for them (let's make things easy, consider only about uploading)
q1 is the uploading queue for C1, and q2 for C2.
What I want is, when two of the computers are using networks, they got 50-50.
But when one of them is ideal, and the other is using, he got 100%.