Optional packages are reinstalled when they are already installed.

Go to the following page:

http://java.sun.com/j2se/1.4/docs/guide/plugin/developer_guide/extensions_example.html#testing

and take the link to either test example. s_my_jmf.jar will ge installed in lib/ext on your computer. Now take the link again. Even though s_my_jmf.jar has been installed, Plug-in will install it again.

All resources for this test can be found at:

http://java.sun.com/products/plugin/extensions/examples/jmf

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Find resources at:

http://webwork.sfbay/products/plugin/extensions/examples/jmf

rather than previous listing.

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