Best regard,
I am building an app with West Wind Web Connection, I need to add security to restrict users to certain app options even if they are already logged in. How can I do it?

Probably need to implement roles or add access levels for users. If you use the wwUserSecurity (built-in or the add-in) you can add fields to the user record and query that information at runtime. Roles tend to require another table, while access levels or a roles memo that lists out roles can also be used to specify the membership.
In app code you can then check against these values on your user - best with custom methods like IsUserInRole("Administrator")
to make it easy and consistent in app code.
Either way you have to build it yourself... there's no built-in way to do this.
+++ Rick ---