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Re:The Computer for the 21st Cenury (1991) [pdf] by Someone on Thursday May 10, 2018 @06:33AM (#17037677)
”Software vendors have no incentive for making it easy for people to exchange data between devices and software they have no control over”

That isn’t needed to get the multi-device UIs for “multiple tablets could be quite useful if there was a good way to coordinate the displays and interactions between them”; the devices could all be from the same manufacturer. For example, games where not all players get the same information (e.g. scrabble, cluedo, many card games) could have the shared UI on a tablet, with players using their phones for looking at their cards/stones.

Re:The Computer for the 21st Cenury (1991) [pdf] by TeMPOraL on Thursday May 10, 2018 @07:23AM (#17037918)
In that case there's exactly nothing preventing such UI from happening. But that's not "ubiquitous computing", that's just "a multiplayer game".