Procedure FreeMem(Var P:Pointer;Size:LongInt);

    This releases pointer P  that  was  allocated  by  GetMem.  The value
    in  Size  is   not   used.    The   correct   amount   of  memory  is
    automatically deallocated (unlike System.GetMem).

    If successful,  P  =  NIL.   If  unsuccessful,  P  remains  unchanged
    or the program halts.