The title of my post reflected my ignorance of origin of computer use of term of Sandbox. Now I understand why you picked the term.
From Wikipedia:
http://en.wikipedia.org/wiki/Sandbox_(computer_security)
Wikipedia:Sandbox.
"In computer security, a sandbox is a security mechanism for safely running programs. It is often used to execute untested code, or programs from unverified third-parties, suppliers and untrusted users.
The sandbox typically provides a tightly-controlled set of resources for guest programs to run in, such as scratch space on disk and memory. Network access, the ability to inspect the host system or read from input devices is usually disallowed or heavily restricted. In this sense, sandboxes are a specific example of virtualization."