I have a Excell program that I would like to load on Sharepoint.

I would like users to be able to log on via the Internet... enter infomation
into the Excell worksheets...then be able to save this information for
themselves...log in the next day and continue working the spreadsheet.

I want other users to be able to do the same. No user should be able to see
the other users information.

Is this possible ?