Help! How can I check whether the developer tools are installed on my iMac?

Hi, I'm new to macs and would like some help with finding out whether or not the Developer Tools are installed on my iMac.I don't remember having any sort of installation CD/DVD.
Thanks

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http://developer.apple.com/search/index.php?q=xcode
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Help! How can I check whether the developer tools are installed on my iMac?

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