Is there a way to poke around this and perhaps execute the stuff that’s in here if a user is offline and wants to play an applet? This would save me a lot of effort on my part and would eliminate the need for some special plugin for this.
I’m afraid there’s no way for applets.
Maybe you could offer an webstart version (only the jnlp actually, dont know if the applet and this jnlp can/will share the same cache). I believe webstart makes it possible to start using the cache even when the originating server is offline.