A method and system are provided that enhance humanmachine communication so as to more closely approximate natural humanhuman communication by more effectively establishing communications links for human-interactive media. Upon receiving a print job which designates a paper feed cassette, the printing apparatus determines whether the paper size of the paper feed cassette designated by the print job that is stored in a memory matches the paper size needed for executing the print job. The ink-jet head further includes actuator units attached to a surface of the passage unit for changing the volume of each pressure chamber. A method of using the signaling apparatus to locate a bottomhole assembly includes moving the shield so as to modulate the magnetic field created by the magnet, sensing the modulation of the magnetic field, and determining the location of the bottomhole assembly using the information collected.