Indigo is the codename for Microsoft's unified programming model for building connected systems. Avalon is the code name for Microsoft's unified presentation subsystem for Windows....
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publisher/developer site This download (Microsoft Avalon and Indigo) is freeware. "Freeware is copyrighted computer software which is made available for use free of charge, for an unlimited time, as opposed to shareware where the user is required to pay (e.g. after some trial period or for additional functionality)." More info at
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