How do I run applets in general?

Do we need environment variables/classpath? If so, I'm not exactly sure what those are. All I know is how to mechanically set up the classpath directory in Windows XP. To make matters worse, I use Linux at home so I don't even know how to do that at all in the first place on my home machines. If I recall correctly, textpad and eclipse both run my applets but I don't know how to do it with netbeans or the command line.
What I tried to do was to make an web.html file that has <APPLET CODE="TheClass.class"</APPLET> then I went to the directory with a terminal and did appletviewer web.html and it popped up my applet but it said start: applet was not initialized.
I'm at school now so I'm on a Windows XP computer as I type this and I tried to do it here and I got this error message:
E:\TempNetbeansProject\TempNetbeansProject\src>appletviewer inClass1.html
Warning: Can't read AppletViewer properties file: C:\Documents and Settings\LAB2
\.hotjava\properties Using defaults.
load: class AppletPassParam.class not found.
java.lang.ClassNotFoundException: AppletPassParam.class
        at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:210)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
        at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:143)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
        at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:690)
        at sun.applet.AppletPanel.createApplet(AppletPanel.java:785)
        at sun.applet.AppletPanel.runLoader(AppletPanel.java:714)
        at sun.applet.AppletPanel.run(AppletPanel.java:368)
        at java.lang.Thread.run(Thread.java:619)It would be GREATLY appreciated if someone could help me out with the basics!
Thanks in advance!

<APPLET CODE="TheClass.class"</APPLET>Is not valid HTML. It is not even well formed HTML. It should be more along the lines of..
<APPLET CODE="TheClass.class"></APPLET>As already mentioned the class attribute does not need a suffix so..
<APPLET CODE="TheClass"></APPLET>But that element is missing a width or height..
<APPLET CODE="TheClass"
  width="600"
  height="400">
</APPLET>----------------
Two notes:
- As far as input documents for Java based apps. - GI/GO. Do not expect correct output with invalid or malformed inputs.
- Applets are an advanced area of programming. They are best avoided by newbies.

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