A sliding module for a portable terminal which has a first housing and a second housing sliding on the first housing is disclosed, the sliding module slidably coupling the first and second housings. Image data represents an intensity of photoexposure of an imaging array at specific locations in the imaging array and in distinct spectral regions corresponding to color channels. The abutment can be inserted into the slit while oriented in a direction that minimizes its insertion profile. Method includes facilitating transmitting the first encoded message to a module of the server.