I have an internet controlled robot system created by using LabVIEW and VI Server, which allows the user (client) to control the robot remotely (both the client and server need to have LabVIEW software). Now I want to add user authentication to the system(let the user enter user name and password. If the user name and password are correct, the user is allowed to control the robot through internet). I don't have database knowledge. I don't even know where to start. Please suggest me about what I should study (it will be great if u'd suggest me in steps) and what software should I have (I'm having LabVIEW 6.1) or some example programs.