The Macintosh OS was a revolution in both the good and bad senses of that word. Everything we do is interpreted and translated time and again as it works its way down through all of the metaphors and abstractions. When we use most modern operating systems, though, our interaction with the machine is heavily mediated. When we used actual telegraph equipment (teletypes) or their higher-tech substitutes ("glass teletypes," or the MS-DOS command line) to work with our computers, we were very close to the bottom of that stack. So an OS is a stack of metaphors and abstractions that stands between you and the telegrams, and embodying various tricks the programmer used to convert the information you're working with-be it images, e-mail messages, movies, or word processing documents-into the necklaces of bytes that are the only things computers know how to work with. The same is true of Graphical User Interfaces in general. This is exactly how the World Wide Web works: the HTML files are the pithy description on the paper tape, and your Web browser is Ronald Reagan. His listeners, many of whom presumably thought that Reagan was actually at the ballpark watching the game, would reconstruct the scene in their minds according to his descriptions. When the cryptogram on the paper tape announced a base hit, he would whack the edge of the table with a pencil, creating a little sound effect, and describe the arc of the ball as if he could actually see it. The umpire steps forward to sweep the dirt from home plate." and so on. If the count went to three and two, Reagan would describe the scene as he saw it in his mind's eye: "The brawny left-hander steps out of the batter's box to wipe the sweat from his brow. He would sit there, all by himself in a padded room with a microphone, and the paper tape would eke out of the machine and crawl over the palm of his hand printed with cryptic abbreviations. When Ronald Reagan was a radio announcer, he used to call baseball games by reading the terse descriptions that trickled in over the telegraph wire and were printed out on a paper tape. The important thing is that no matter what splendid multimedia web pages they might represent, HTML files are just telegrams. Anyone can learn HTML and many people do. Only the most current version of Tableau Reader is available for download.This crud is called HTML (HyperText Markup Language) and it is basically a very simple programming language instructing your web browser how to draw a page on a screen.Previous versions of tabcmd are available on the same product page as the Tableau Server version you wish to download. To remove your current version entirely before installing an older version, see Completely Removing Tableau Desktop. Installing a new version of Tableau Desktop will not overwrite the old version of Tableau Desktop.
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