/* displays all of the Fields in this Screen */
void Screen::display(bool clear) {
    /* to iterate through the deque with */
    deque<Field*>::iterator field;

    /* if we need to clear the screen first, do so now */
    if (clear) {
        dtioClear();
    }

    /* display every field on the screen */
    for (field = fields.begin(); field != fields.end(); field++) {
        (*field)->display();
    }
}