We have a web site that we are using to extend the functionality of iMIS. In 10.6 we had a custom solution for bridging the login gap from iMIS to our ASP.NET 2.0 solution. With iMIS 15, we gain access to the Unified Login functionality.
If you are writing applications to work with the iMIS database, you should use this technology. It does a great job leveraging the ASP.NET 2.0 membership infrastructure.