Step aside: Women coming through.

Reports on women executives in Australia who have reached the top of their companies and seem poised to become chief executives. Magazine's choice for the 50 women who could be chief executives; Comments from the women surveyed; How their stamina and resolve sets them apart; Importance of gaining exposure to all facets of the business; Difference in management style between women and men; List of the top 50 women executives. INSETS: Cross-pollination of styles gets a chance;Americans over here;The calculated rise of Meredith Brooks, by Maureen Murrill.