Another option is to use a "Portal", then you can have all the data be customized to the individual who logs into the portal.
That is if you are looking to filter out the unrelated data (i.e. One sales rep should not see the sales data from a different rep).
Portals save you a lot of cost long term, and make your app much more secure than having the authentication in a button.
If you are worried about the IP that might exist in your code pages, those code pages can be seen by any and all users, regardless of role.
