Get16()

         Returns an element from an array16

    Syntax:

         Get16 ( aArray, nPos ) -> Nil

         aArray : The previously array16 created
         nPos   : The position to return

    Description:

         Returns the value of an array16 position. If nPos is not
         specified or if is higher to the number of elements of array16
         the function returns Nil.

    Return:

         The value of the specified position or Nil if nPos is not a
         valid parameter.

    Example:

         a16 := New16 ( 15000, 0 )
         ? Get16 ( a16, 1 )          // Is sure that returns 0