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Use the simple equation of "round( value/fraction ) * fraction" to round a number to a specific fraction/decimal.
Use the getHttpRequestData() function to retrieve all the data sent from the client in the HTTP request to look for special headers that indicate an AJAX request.
Use the getMetaData() on a query object to get access to its "result" structure.
Create a small UDF for generating the necessary code to create a JavaScript date object from a ColdFusion date object.