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The SCREEN function returns an ASCII character code or a color code from
a specified screen character location.
 
SCREEN (line%,column% [,colorflag%])
 
Usage Notes
    ■ If the character at (10,10) is A, the following statement would
      return 65, the ASCII code for A, to the variable X:
 
        X = SCREEN(10,10)
 
    ■ Note: In graphics screen modes, if the pattern on the screen at the
      given character location does not exactly match any pattern in the
      current ASCII character set, the SCREEN function returns the ASCII
      code for a space. If colorflag% is nonzero, the SCREEN returns 0.