>Imagine an OS where you can do something like "view source" with html, you can edit it, and immediately re-execute it. Do you mean view the kernel's source? O

>Imagine an OS where you can do something like "view source" with html, you can edit it, and immediately re-execute it. Do you mean view the kernel's source? Or user program source? Either way, this already exists, it's just often unsuitable for OS software.