For quick demonstrations, the internal laptop USB ports and ungrounded domed user interface will suffice, but for anything else we strongly recommend the "ruggedized" setup described above. Otherwise, one significant user-generated spark could cause the dial interface to cease functioning until the laptop is rebooted. (Sometimes unplugging the user interface, counting to 5, and replugging in will reset things, but other times not... Also, if a sufficiently large static discharge is applied to an ungrounded dome, it can permanently damage the computer's USB port.)