Question about API In C#

We are a group of seniors majoring in Computer Science. As part of our graduation project, we need to write a program that allows us to monitor a user's computer access (including internet access and preferals). This is the point when we come to you for help to provide us with the API functions to accomplish the following: • Save the email address of any (sent and received) emails • Save the contents of emails (sent and received) including attachments • The function that creates a new user in the system • The function that can track the users use of any peripherals (printers, scanners ect.) • The function that save the page address (URL) which the user open it. We are using C# in Visual Studio.Net environment. Any help in providing us with these API functions that correspond with this environment will be greatly appreciated. If you have any further questions or need any more details, please feel free to contact us at your convenience. Best regards.