Does Watch Widow has documented interface.

I'm working with Watch Window from my VSpackage plugin.

I want to get selected item in the Watch Window from VSpackage. 

I see that there is no any interface description in the MSDN. 

The only info i have found about it is the following:

vsWindowKindWatch

GUID value = {90243340-BD7A-11D0-93EF-00A0C90F2734}.

vsWindowKindWatch is used to get a handle to a particular window in the integrated development environment (IDE) in order to gain access to its properties and methods.

Where are these methods described? Are they documented?

Window window = dte.Windows.Item(EnvDTE.Constants.vsWindowKindOutput);

It is the only thing i can do. Get access to the base Window object.

Thanks.