A package identifier for a package from which an application is installed on a computing device is obtained. In one embodiment, a method for providing emergency services may be performed by a portable device operating in a communication system. The heated forced-air nozzle is formed to include a series of circumferentially spaced-apart passageways in which heated forced air is communicated through from the heated-air passageway. Graphics data may also be output asynchronously to a CRT. The light that passes through the clear regions of the first phase and the light that passes through the clear recessed line pattern of second phase have a phase difference of 180 degree.