Group,

A user in my company recently presented me a cool "product
configuration" tool he'd created within Excel. He must have spent
hours/days/weeks creating it.
We are working in a Citrix environment, and I would like for the rest
of my users to use this configuration tool.

However, I would like to prevent my users from "running" off with the
tool. So I am trying to consider different ways of securing it.
Obviously I can make it read-only, so they'll need to enter a password
to be able to make changes.

Is there a way to lock it further down - like fx. putting a password
protection in place, that will either check a web application for
authentication, or expire after say 1 month?

I am aware that the tool should have not been done in Excel, but
rather some sort of DB application. This, however, is not the case.

Any hints would be much appreciated.

Mike