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Chapter 29. Internet Security > Limiting Java Applets

Limiting Java Applets

Like ActiveX controls, Java applets extend the capabilities of Internet Explorer by displaying and manipulating data and images in ways that HTML can't. There's a significant difference between ActiveX and Java, though. Java applets run in a virtual machine with strict security rules. The Java Security Manager (sometimes referred to as the "sandbox") prevents applets from interacting with resources on your machine, whereas ActiveX controls are specifically designed to work with files and other applications.

Unlike ActiveX controls, Java applets are not stored on your machine. Instead, every time you access a Java-enabled page, your browser downloads the applet and runs the program in the Java virtual machine. When you've finished with the applet, it disappears from memory, and the next time you access the page you have to repeat the download. Over slow links, large Java applets can take excruciatingly long times to load, although the results can be impressive, as the example in Figure 29.18 shows.


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