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 sound()                 Turn Speaker On at Specified Frequency

 #include   <dos.h>

 void       sound(freq);
 unsigned   freq;

    sound() turns the PC's speaker on at 'freq'. 'freq' specifies the
    frequency of the sound in Hertz.  Call nosound() to turn off the
    sound.

       Returns:     Nothing.

   Portability:     IBM PC and compatibles only.

   -------------------------------- Example ---------------------------------

    The following statements turn on a sound then turn it off.

           #include <dos.h>

           main()
           {
              sound(4);
              delay(500);
              nosound();
           }