I am trying to implement Oracle Single Sign-on with our Oracle 9i and 10g databases in a Windows environment. We have an internally written legacy application that we are trying to incorporate Single Sign-on. I have been able to use Single Sign-on when I use SQL+ from the command prompt. But I have not been able to implement it with our Legacy application. I have Oracle 9i and 10g Enterprise Editions installed with none of the added cost features such as Advanced Security.
Are there other Oracle pieces that are needed for SSO to work with legacy products?
Can someone point me to some documents with instructions?

Thanks in Advance,