I have created a very basic helpdesk program for our company. What I would like to do is to add some security to it. I would to be able to initiate a logon screen when you first enter the application. Everybody will have the same role so there is no need for access rights inside the system on certain functionality. All I want to to allow or deny acess to the program when they enter the program. How do I go about doing this?

Many Thanks