Not that this is relevant to DOS software, which needs whole-system heavyweight emulation right from the start these days, but... It would be interesting to ha

Not that this is relevant to DOS software, which needs whole-system heavyweight emulation right from the start these days, but... It would be interesting to have a solution which allowed you to progressively wrap software to allow it to run in just as much isolation as it needs, from the ultra-lightweight scripts that just futz with LD_PRELOAD (when most of the environment is still there) to actual Docker images (when the OS is still there) to images to run in a hypervisor (when the hardware is still there) to full-on heavyweight system emulation like SIMH, for when even the hardware has gone. It's all very Tao: When the userspace libraries have gone, there is LD_PRELOAD When the filesystem hierarchy is gone, there is Docker When the OS is gone, there is Xen When the hardware is gone, there's SIMH. Hi, SIMH! https://www.youtube.com/watch?v=Vkfpi2H8tOE https://www.youtube.com/watch?v=Vkfpi2H8tOE Laurie Anderson — O Superman