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            Introduction 
             Algorithms (i.e. step by step procedures 
              for solving a problem) have an important role in decision making 
              and are a key format for sharing of medical information.  
              In Surgical Pathology algorithms usually take 
              the form of decision tree diagrams or of differential diagnosis 
              listings. Data entry to the algorithm is almost always in the form 
              of qualitative variables (presence or absence of morphologic patterns 
              or of morphologic features). Despite the large number of published 
              algorithms, many are not widely used or are underutilized. Some 
              of the barriers to their application lie in the lack of knowledge 
              that they exists and in a lack of availability at the point of care. 
              AlgViewer works as a client to a central algorithm 
              repository, mirroring locally the repository's tree and allowing 
              easy access and interactive graphic visualization of the algorithms. 
              In addition it permits uploading of newly created algorithms, allowing 
              the sharing of new contributions among a community of users.             
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