<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> MAR-31-2000 <PERIOD-START> APR-01-1999 <PERIOD-END> SEP-30-1999 <CASH> 35,132 <SECURITIES> 92,558 <RECEIVABLES> 25,449 <ALLOWANCES> 6,802 <INVENTORY> 1,139 <CURRENT-ASSETS> 162,965 <PP&E> 83,394 <DEPRECIATION> 35,573 <TOTAL-ASSETS> 221,293 <CURRENT-LIABILITIES> 46,386 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 44 <OTHER-SE> 174,659 <TOTAL-LIABILITY-AND-EQUITY> 221,293 <SALES> 57,710 <TOTAL-REVENUES> 57,710 <CGS> 5,490 <TOTAL-COSTS> 5,490 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 0 <INCOME-PRETAX> 6,815 <INCOME-TAX> 2,071 <INCOME-CONTINUING> 2,071 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 2,071 <EPS-BASIC> 0.11 <EPS-DILUTED> 0.10