What tasks CANNOT be performed by an applet?

It is necessary that a browser implement security policies to keep applets from compromising system security. The implementation of the security policies differs from browser to browser. A SecurityManager object on a Web browser is used to implement its security policies. Whenever a SecurityManager detects a violation, it throws a SecurityException. An applet can catch this SecurityException and react according to the exception. The following tasks CANNOT be performed by an applet:

1. Load libraries or define native methods.
2. Ordinarily read or write files on the host that is executing it.
3. Make network connections except to the host that it came from.
4. Start any program on the host that is executing it.
5. Read certain system properties.

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