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     The strlwr function converts any uppercase letters in the given
     null-terminated string to lowercase. The strupr function converts
     any lowercase letters to uppercase. Other characters are not
     affected.
 
     The _f... forms of these functions are model-independent (large-
     model) forms that use far pointer forms of the <string> arguments
     and return values. These model-independent functions can be called
     from any point in the program.
 
     Return Value
 
     These functions return a pointer to the converted string. There is
     no error return.
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