C#.net 2008 custom controls

Question

As two girl developers at work, we want to to know how to do the following in a C#.NET 3.5 non-web application:
1. I have a delgate in one project  and I want to have the delegate be executed from a click event in another project. How do I setup this type of a project refernce?
(Note: This is existing code that is not working. Some other programmer wrote it.)
2. I have setup a control that I want to share with several projects within one solution and a copy of different solutions. Thus can you tell me:
a. How to compile(build) the custom contol to generate a DLL?
b. Once I have the DLL, where do I place in the folders so that various projects can access it?
C. What do I do in the .net to solution to add it (be connencted)  to other parts of the solution? What should I do to include the custom control in other C#.net solutions?