Bureaucrats, dave_user, Administrators
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→Inter-world communication
===Inter-world communication===
Even if it is technically possibly possible to implement a system where W1 and W2 are completely isolated, the majority of real applications need a communication mechanism between the two worlds{{efn|From a different point of view, this is a sort of break in the barrier between the two worlds. As such it poses non-trivial issues in term of integrity and timeliness in the Trust world. This matter will be covered in more detail in following sections.}}.
Several options are available to implement such a mechanism, each of which having different pros and cons. Exhaustive comparison of all of them is beyond the scope of this paper. Nevertheless some aspects will be briefly discussed and some useful links will be provided to study this notable subject in more depth.
