I'm looking to propose a solution from a PC setup that involves Deep Freeze (to keep user from modifying the programs/system) to a virtual machine (Parallels or Fusion) on a Mac. Those in charge would like the virtual machine to be locked so that it couldn't be tampered with, so is this doable? I do not have any experience with Deep Freeze, but from what it looks like on the website, it modifies the BIOS, etc., and all I need to be able to do for the Mac is lock the virtual system from change (and not tamper with the Mac's hardware). Would Deep Freeze do this, or is there something else I can do to lock the VM disk image on the Mac? The VM will be left in a suspended/saved state when not in use.