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Critical applications are software essential to business continuity, and can be classified as either mission-critical or business-critical. Mission-critical applications require 100% uptime. The unavailability of one of these systems can have tragic or extreme consequences. Examples of mission-critical applications include such functions as air traffic control, 911 emergency call centers, stock exchange trading floors, and aerospace mission control. As compared to mission-critical applications, business-critical applications can tolerate minimal interruptions. A business-critical application is extremely important to a company, but small amounts of downtime are allowed. These applications include the following:
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