When do jars get loaded when preload specfied on cache_archive_ex param?

I've read the supporintg documentation for the cache_archive_ex parameter: http://java.sun.com/j2se/1.4.2/docs/guide/plugin/developer_guide/applet_caching.html#cache_archive_ex
But it does not seem to indicate when the jar is pre-loaded. I assume when the plugin is initially launched from the first web page the user touches that requires the plugin.
Is this true?
Thanks,
ForceRs

I've made a little progress on this. I turned on full debug in the Java Plugin console (by brining it up and pressing 5 to "set trace level to").
It seems that the jar(s) preload only as invoked.
I wonder what the preload adds as a benefit, if any?

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When do jars get loaded when preload specfied on cache_archive_ex param?

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