Holy cow, I wrote a book!
The Windows 7 taskbar automatically groups similar windows,
and when you right-click on the grouped icon, you may get fancy stuff
like a jump list or a task list,
but you will also get a very small repertoire of window management
In particular, the only option that operates on the group is
Close all windows.
What about the other group options?
To get a list of more group window options,
hold the shift key when you right-click on the grouped icon.
Then you'll get more options like Cascade and
Minimize all windows.
Since the contents of the regular right-click pop-up window
when you hit "C" for Close all windows,
it still waits for you to confirm by hitting Enter.
On the other hand,
the shift+right-click menu auto-executes
Close all windows when you hit the "C" hotkey.
Doesn't save you any more keystrokes (trading an Enter
for a shift key), but you do get predictability
since the shift+right-click menu is pretty stable.
Bonus tip: To get the System menu for a window,
you can right-click on its pop-up thumbnail.