Can anyone explain me how to handle concurrent AJAX requests?

"JavaScipt closures can be used for

handling concurrent requests. A function can be

written to handle such requests. Once processing

of code is over, URL and the call back function

to call can be passed as parameters. These

parameters are passed to the AJAXInteraction(url,

callback) object. Closures insure that the proper

callback function associated with a specific AJAX

interaction is called."