Make a SSO project.
First of all I am gonna define to you what the meaning of one sign in module, and after that I am gonna give you some steps to do that. Actually the one sign in module is a kind of authorization, and authentication that will be implemented for you application but the meaning of one sign in is that you make your whole package of applications interact with the system, active directory, LADP information, so you don't have to enter your log in information -user name , password- every time you open an application from you package, it will take them from the from an internal resource as I mentioned before like active directory.
BA information technologies. Delphi programmer and programming team leader (15 years experience). Experience working with MS SQl SERVER, MYSQL, MS ACCESS, MS FOXPRO, INFORMIX, FireBird Visual studio C# .net, Indy(TCP/IP), WPF, Entity framework, Web Services, SOAP, XML processing, HTML CGI, office components automation and many others...