Ok, this is kinda dumb. I\'m trying to wrap my head around the use of the MVC and Command Patterns. The questions basically concern where to place code.
In the MVC patte
While there are many variations based on the needs/complexity of an application, you typically find them implemented in the Controller. Here is a great article on using the Command pattern in an MVC architecture. I'm not sure what type of application you are building, but here are a few more resources that show implementations on different application stacks.
http://java.sun.com/blueprints/guidelines/designing_enterprise_applications_2e/web-tier/web-tier5.html
http://msdn.microsoft.com/en-us/library/ff647590.aspx
http://www.phpwact.org/pattern/model_view_controller