real time read & write of excel spreadsheet on website
 

I am trying to make a continuously updated excel spreadsheet available on a
password protected website in real time (ie when the spreadsheet is updated -
the webpage will be updated).

To make this more complex, the user on the website needs to be able to
update the excel spreadsheet on the server. And, potentially, run macros
that are embedded in the spreadsheet.

Any programs/components out there that would make this happen? Or will it
need to be programmed specifically?