How to create a process which is running in background?

I am developing an application which creates a data file after some queries are done. The user sees a message saying that the data file is being preparing and a email notification will be sent to the user. I would like to have the process for creating data files run in background so the user does not wait till that process is done.
Could someone give me some ideas or suggestions how this should be done?
Thanks in advance!

You could use a servlet and run a seperate thread to complete the process. An easier way is to use an IFRAME. You can direct a page to run in an IFRAME that is 0 width X 0 height. The user could then continue on without having to wait on the process to complete.

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