A delivery apparatus for a self-expanding stent is disclosed. The first layer is made of a composite material of a porous member and a filing material supported by void portions of the porous member, the second layer is made of the filling material or the porous member, and the first layer and the second layer are present in this stated order. The seal member effectively prevents droplets mist from penetrating to the electric circuit. Trace logic is provided for receiving indications of the sequence of operations being performed by the device, and for generating from the indications a stream of trace elements. Public title information may be furnished to a host operating system windowing system to identify a window owned by a process running on a high-assurance operating system.