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Cidaemon is the "Content Indexing Daemon", which is a background process that builds a fast search index of the files on your computer.
What is cidaemon?
That’s the “Content Indexing Daemon”; a background process that builds a fast search index of the files on your computer. Chances are you don’t need it, and can disable the indexing service. “Black Viper” has a good overview of XP Services.