Unique Excel spreadsheet - Help!

Hi

I have a client that needs some work done and I am not sure how to do it or if it is even possible.

I have made a User Registration System. The System works as follows:

Users register and then proceed to login to a Profile page which has been set up to show information that is unique to that user.

For example, their name.

I managed to show users unique information by filtering a Recordset on the session variable created when a user logs in.

Anyway the problem is

Although the system works, and the users unique information shows. My client want each user to be able to access and download an excel spreadsheet that is unique to that user.

I would like to know how to do this

I would also need to know how to set up a excel spreadsheet to show unique information.

However if this is not possible, I would appreciate an explanation just so I can explain it to my client.

Thank you and I really appreciate it!