玥世界

這是我目前看過對乙太網路最簡單又清楚的說明！文件是1991年寫的喔～
RFC 1180
sec. 3.1 A Human Analogy　(P.8)
A good analogy of Ethernet technology is a group of people talking in a small, completely dark room. In this analogy, the physical network medium is sound waves on air in the room instead of electrical signals on a coaxial cable.
Each person can hear the words when another is talking (Carrier Sense). Everyone in the room has equal capability to talk (Multiple Access), but none of them give lengthy speeches because they are polite. If a person is impolite, he is asked to leave the room (i.e., thrown off the net).
No one talks while another is speaking. But if two people start speaking at the same instant, each of them know this because each hears something they haven't said (Collision Detection). When these two people notice this condition, they wait for a moment, then one begins talking. The other hears the talking and waits for the first to finish before beginning his own speech.
Each person has an unique name (unique Ethernet address) to avoid confusion. Every time one of them talks, he prefaces the message with the name of the person he is talking to and with his own name (Ethernet destination and source address, respectively), i.e., "Hello Jane, this is Jack, ..blah blah blah...". If the sender wants to talk to everyone he might say "everyone" (broadcast address), i.e., "Hello everyone, this is Javk, .. blah blah blah...".

Do not ask me anything about English. There may be many mistakes including spelling.
 
Ajax & PHP without using the XmlHttpRequest Object
This might be a useful idea if I can understand what is it going to say...
 
Key Idea:
If we can't use the XmlHttpRequest object, we must find some other way to include content from another page, without having to resort to other objects or non-standard things. A great candidate for this would be the <script> tag, which is used to include external JavaScript files. What if, instead of using a regular JS file, we point that tag to a PHP file, which outputs JavaScript.
Things I do not understand:
1. XmlHttpRequest Object
2. How do I use JS file in Web
3. What is a "tag" here
4. What is the main "flow" in an aJax web
5. Can I use two windows to passing all data (if no pup-up blocking)
 
xaJax
Here is a web of xaJax, which others suggest the best of all knids of aJax.
 
ASP.NET AJAX Framework 入門篇
They said it is a good introduction, but since I do not like to learn .NET, I do not read it. Keep it in case of I need to fined something.
 
Ajax教學
I like it, even if I do not finished reading it.
 
REMEMBER THIS:
if (window.ActiveXObject) {
  xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); // so IE will ask if the user want to allow activeX, orz
}
else if (window.XMLHttpRequest) {
  xmlHttp = new XMLHttpRequest();
}