To store data in XML temporarily

Question

Hi

i have a web application which I can access from client machine by having Internet Explorer and it gives a call to the server which fetches the data and all operations are performed server side only.
Now I want to call a HTML page on client side and perform some operation on it and store the data temporarily in the form of XML on client machine only and submit the entire data at one go to the server.
Plz guide me how to do it.