The restrictions on applets include the following:
• Applets can’t read or write to the reader’s file system, which means they cannot delete files or test to see what programs you have installed on the hard drive.
• Applets can’t communicate with any network server other than the one that had originally stored the applet, to prevent the applet from attacking another system from the reader’s system.
• Applets can’t run any programs on the reader’s system. For UNIX systems, this includes forking a process.
• Applets can’t load programs native to the local platform, including shared libraries such as DLLs.