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most of the time the throbber is a still image (known as its resting frame), but when the program is performing an action the throbber begins to animate in a loop to let the user know that the program is busy and has not frozen.
la mayor parte del tiempo el throbber es una imagen fija, pero cuando el programa está realizando alguna acción el throbber comienza a animarse en un bucle para hacer saber al usuario que el programa está ocupado.
== history ==one of the early (if not the earliest) uses of a throbber was in the ncsa mosaic web browser of the early 1990s, which featured an ncsa logo that animated when mosaic was downloading a web page.
== historia ==uno de los primeros (sino el primero) usos de un throbber fue en el navegador web ncsa mosaic al comienzo de los años 90.
