Minimum Operating System Requirements:

• Windows 98, NT, XP, 2000
• Macintosh OS X
• Any flavor of Linux or Unix.

Minimum Browser Software (one of):

• Netscape 7.0 with Java plug-in 1.3 or higher (no plug-in needed with Mac OS X)
• Internet Explorer 5 or higher. (Note that if you have Internet Explorer 6, you may have to download and install the Java Virtual Machine software (JVM) from Sun, at http://java.sun.com/getjava/. If your browser shows a blank screen for more than a minute or so after you try to start a lab, you should download the JVM and install it. Then quit and restart your browser, and try to run the lab again. Hopefully it will work this time.)
• Mozilla 4.0 or higher
  

If the laboratories don't run:

(This text is borrowed from navsurf.com:) When a Java applet fails to load correctly, the browser will often display an error message that contains important information to the source of the failure. The error message is either displayed on the status bar, the Java console or both. Status bar messages are often sufficient to determine the cause of error. You may also wish to opening the Java console to get a full description of the error in order to report the problem to the author of the applet.

The first thing to check is whether Java is enabled in your browser. Although it is enabled by default on all browsers, it may be accidentally disabled.

• If you are using Internet Explorer, go to Tools -> Internet Options -> Security and click on Internet. If the security level is set to Custom, click on default level to set the options back to its default settings.
• If you are using Netscape, go to Preferences -> Advanced and check there is a check mark beside the "Enable Java" option.