1. One or more computer-readable storage media that store executable instructions to use a compliant version of software on a first host, wherein the executable instructions, when executed by a computer, cause the computer to perform acts comprising: receiving a communication connection from a guest device; checking whether a software item stored on said guest device complies with a first policy on said first host; determining that said software items complies with said first policy; executing, on said first host, said software item that is stored on said guest device; and using said software item to perform a tangible action.