Is it possible to upload an excel document to a web-host and to allow certain users to edit the file real-time? I have a database of employees,and it would be wonderful if certain employees could simply go to our website and change certain values without having to re-upload the modified file using FTP and so on.

In other words, i need the user to go to the website, enter their login, edit the file, and simply log out.

Is this easily possible?