A more precise description

More precisely, according to allegro.cc, the call to the function named textout_ex in Listing 5:

• Writes the string "HELLO WORLD" onto the bitmap pointed to by the value of the variable named screen
• At position 20,30,
• Using the font pointed to by the variable named font
• With the color of the characters specified by the RGB color value 255,255,0 (yellow), and
• The color of the area behind the characters specified by 255,0,0 (red).