document: Dueling platforms -LSB- healthcare network servers -RSB- Many large hospitals and healthcare systems have grown accustomed to the reliability of mainframe architecture , although tighter operating budgets , coupled with advances in client/server technology , have led to more office and clinical applications being moved off mainframes . But Evanston Northwestern Healthcare was n't ready to get rid of its IBM OS 390 mainframe just yet . While a number of new clinical applications are being installed on two brand new IBM servers , Evanston Northwestern Healthcare will retain its favored hospital billing system and let it reside on the organization 's mainframe , as it has since 1982
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