Run multiple instances of emulator with shared disk

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From Tim Sirianni:
1)  I would love to be able to run multiple instances of the emulator, with the 
possibility of running shared disk among them.  I believe indexedDB is capable 
of shared access, isn't it?   Even if shared disk isn't possible it would be 
fun to run multiple emulators, which I guess means being able to set the name 
of the disk subsystem IDB to open, so this might be an easy change to make 
while you're in the code.  Yes, this is a way to get around the just-one-thread 
javascript execution model.  Two one-processor emulated system should run twice 
as fast a two-processor one on a two-core real system.

Original issue reported on code.google.com by paul.kimpel@digm.com on 20 Jul 2014 at 2:38