What are the other settings needed to access the APIs in my C# app? Any advice would be greatful.
Thanks.
I don't think that there are many more settings as such. If you want to create a plug-in then you will need to implement the IBBPlugin interface and create a COM visible assembly. If you want to create an application the you will need to use the REAPI object in order to connect to the API and log in to RE. Once you have done these things you are able to use the API object model however you wish.
Take a look at my blog which has a lot of tips and undocumented information about developing using the API. It is mainly in VB.NET but hopefully should still be understandable to somebody developing in C#.
David