The Sundial is a class, and instructors may establish policies and procedures regarding the content of classes.

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Edmodo also has iPhone and Android mobile apps to view content from classes.

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"Ultima Forever" will be released free-to-play for PCs and the iPad this year, with more character classes, content and platforms announced later.

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Udemy, a three-year-old company that delivers classes online, aims for a more practical mix of content.

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