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I got the answer to this question on WordPress Stack Exchange website:
http://wordpress.stackexchange.com/questions/6931/is-there-a-wordpress-function-that-i-can-use-to-retrieve-the-current-page-that-is
http://wordpress.stackexchange.com/questions/6931/is-there-a-wordpress-function-that-i-can-use-to-retrieve-the-current-page-that-is