I was having this idea of having a computer inside a computer
when I started learning programming quite a long time ago,
particularly useful in tricking viruses into thinking they're wrecking
stuffs in the real environment where in fact they're inside a virtual
computer. Unfortunately, not long then, I found out that there's
already company doing this, but for different purposes.

Now this norman sandbox got me recalled of this virtual computer.
So basically, when the virus make system calls, how could we
intercept it and return false values as to trick it and simulate a
virtual computer environment?