Lockdown software? You must mean Deep Freeze. The key reason for using Deep Freeze is for software load stability....
From the Faronics web site:
"Deep Freeze instantly protects and preserves original computer configurations, eliminating routine IT maintenance while allowing complete unrestricted access to a workstation. Regardless of the changes made to a workstation, simply restart to reset the computer to its original state. The result is a protected, parallel network, free of viruses and unwanted programs. Deep Freeze is available for both Mac and Windows platforms"
With this software, you simply need to power off and then on again to put the machine back into it's original state. This is especially useful if you are making a cabinet to give away to a friend or relative. Save for a hardware failure, the answer to the problem is always simply to power off & on again / reboot.
As for highscores.dat files, etc. - you can set up a "thaw space" for those files, which is essentially a writable partition. I was just wondering if anyone else is doing something similar. Deep Freeze is about $25 per seat unless you make a large bulk purchase.
Too busy lately to work much on my bartop. Hope to make some more progress this week.
Jason