A portable user interface device for performing wireless communications. The device includes a case, a display screen, a speaker, a microphone, a sensor, and a computer. The computer is disposed behind the display screen to define a display side, and the sensor is located adjacent the display side. The computer is programmed to control operation of the display screen and to operate a wireless form-filling module, a wireless data transfer module, and an application module. The form-filling module is of a type adapted to promote source data-type interface with a client server servicing the user interface device and limited data transfer capacity. The data transfer module includes a wireless transceiver and is adapted to communicate with a data transfer service on a non-priority, limited size basis. The application module performs a designated operation via the form-filling module and the data transfer module, displaying indicia immediately adjacent the sensor.