A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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Applications that run on Linux natively or questions about using the API on the Linux platform.
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Questions about displaying things with minimal latency, or apps that do so.
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Apps that live in ... um, that thing in whichever corner of your screen, with all the icons in it.
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a Firefox or Chrome extension that customizes the appearance of web-pages that you browse. That is, Stylish lets you "Theme" or "Skin" pages you visit by allowing you to overwrite CSS st…
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Winter Bash (holiday hats) celebration at the end of each year. Use this tag for Apps, Scripts, or API questions that enhance the Winter Bash experience.
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on-topic or off-topic for stackapps.com.
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its own meta site. Use this tag to help differentiate moderation questions from the usual Stack Apps post.