I have an already existing VB app, that I can modify and add some code, that I wanted to deploy, but need to come up with a solution to validate on-line to allow the application to work. Basically, to validate if a client has paid, let's say, the key would be turned on, and if not, the app key would be turned off. I can logically create the code, but need some ground-level advice on how and what (and some code) to do this. What is involved. Conceptually it seems simple, I have a list of clients, with a flag of 1 or 0 (on/off). I can update this value at will. The client app upon runtime, or say every 30 days, goto a designated site, look up the client, see the value, and let it do its thing from there. Any ideas on what the best approach is, and how to do something like this? I'm creating a service model for this app. Thanks!