Method argument descriptions?

What attributes should be applied, ie:

public void some([Description("Obj1")]object a, object b)

Code:

/// <summary>
/// This is MyMethod, and it does stuff :)
/// </summary>
/// <param name="a">'A' is the first parameter, where you 
/// should put Object number 1</param>
/// <param name="b">'B' is the second parameter, where you 
/// should put Object number 2</param>
public void MyMethod(object a, object b)

For more information:
http://msdn.microsoft.com/msdnmag/issues/02/06/XMLC/

Edit: If you actually want the 'Description' attribute for reflection or something, you can't use it on parameters. Attributes can only be used on classes, properties, fields, methods and constructors - not parameters. That would be like placing an attribute on a local variable - kinda silly.

Well, now I know how to set them. Thanks ...and how can I get them from other's (compiled) assemblies, like those in the FW?