SET_INTERLOCKED

 The SET_INTERLOCKED function  assigns  the  value  TRUE  to  the
 parameter and returns its original Boolean value.


 Syntax:

    SET_INTERLOCKED( b )


 The variable 'b' must  be  a  variable  of  type  Boolean.   The
 variable  does  not  have  to be aligned; therefore, it can be a
 field of a packed record.