Java Networking

1.1 Should I use ServerSocket or DatagramSocket in my applications?

1.2 How do I get the IP address of a machine from its hostname?

1.3 How do I perform a hostname lookup for an IP address?

1.4 How can I find out who is accessing my server?

1.5 How can I find out the current IP address for my machine?

1.6 Why can't my applet connect via sockets, or bind to a local port?

1.7 How do I display more than one page from an applet?

1.8 What is a malformed url, and why is it exceptional?

2.0 Why is a security exception thrown when using java.net.URL or
      java.net.URLConnection from an applet?