A network socket application programming interface running on a communication device is operative to provide, to applications running on the device, information about the performance of communication links used by sockets for communicating across a network. The circuit unit accommodation box includes a box body and a receptacle. The invention therefore further relates to a membrane comprising a poly according to the invention, and to the use of a poly according to the invention in a separation process. Spatially distributed images of the purported skin site are derived and correspond to different volumes of illuminated tissue of the individual. After the door between the second and first secure areas closes, exit from the first secure area is permitted. Pharmaceutical compositions containing the compounds and methods of using the compounds are also disclosed.