pencolor 255,0,0 sets the color of the pen to red. 255,0,0 is a RGB-combination where only the red value is set to 255 (fully on) while the others (green and blue) are set to 0 (fully off). This results in a bright shade of red.
corlapis 255, 0, 0 fai que a cor do lapis sexa vermella. 255, 0, 0 é unha combinación RGB onde só a cor vermella é 255 (total) mentres que as outras (verde e azul) son 0 (nulas). Isto resulta na cor vermella.