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Used from a command line , the utility allows you to keep your drive running in tip-top shape , even on a computer that is currently running at the time . These tutorial programs run on any computer that supports OpenGL . I think we established some time frames for ourselves before we had the computers that we have today . " A firewall is a set of computers that use various filters to allow only authorized messages to pass through . One of the larger is basing a national insurance system on computers that are defenseless against any external threat , another that those " toy-computers " are exposed to external threats . Otherwise , if you hear Sheryl Crow and her backup singers doing completely synchronized , millisecond jumps between discrete notes during a fast trill , then you know it 's a computer that 's doing the singing and not Sheryl Crow . Each node also contains a computer that performs target range , azimuth , and elevation detection . The only way a roamer can operate over the entire country is for the system to be tied into a central computer that keeps track of everything . Even before the Web browser Netscape was released in October 1994 , NHGRI used the growing network of computers that would become the Internet to share scientific information .