12. MOÃI THÔØI ÑIEÅM CHÆ COÙ 1 TAÙC VUÏ TRONG BOÄ NHÔÙ Operating System Job i Boä nhôù trong
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21. HEÄ THOÁNG CLIENT-SERVER Server: Windows 2000 Server Web Server: IIS (Internet Information Server) Mail Server: Microsoft Exchange 2000 Database Server: SQL Server 2000 Client: Windows 9X, Windows NT Workstation, Windows 2000/XP (Home, Professional) Microsoft BackOffice