Open word doc template in client system & save it back to server

Question

In .NET web application, On clicking Word icon, a document template is to opened in MS-Word (only if the client system has MS-Word). User can modify the template, save it and close the MS-Word application. The changes made should be saved to the database.(to be save onto the server) This window contains two buttons – OK and Cancel. On clicking OK, any changes made to the document template are saved and the window is closed. On clicking Cancel, this window closes without saving the changes. Invoking MS-Word on client’s machine. Changes made in MS-Word should be saved in the database residing on the server. How can i invoke Word template with data from server database on client system and how to save changes made to the document back to the server?