As primary Web function is asynchronous information publishing, Web-based collaboratories inherently link two models
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Both modes focus on the basic concept of a "shared object"
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Both modes can share presentation tools
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Synchronous mode may create or persistently enhance/modify shared objects
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Web database linkage technology (based on JDBC/ Enterprise JavaBeans) promotes complex asynchronous collaboration by exposing rich data models of industrial-strength relational and OO DBMS's
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Need Both! Tango can be linked to Oracle, Lotus Notes and similar database systems -- XML is a powerful interface for such linkage
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Tango offers "guided tour" sampling a large asynchronous web site, CDROM, database
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