To make clear what is this question about, this is the Windows Task Switcher:
The closest to hide a window from the AltTab Task Switcher that I have found is the Minime tool, but it hides too the window from desktop, and I only need to hide its Task Switcher instance.
I need to see the window on the desktop, but I would like to hide it only from Task Switcher.
Some tools like those referred in this thread have same behavior.
Is there any method?
Additional Points:
- Hiding the window from the TaskBar is not relevant here. It does not bother me whether it is or not there.
Why could I need that? The Bat! from RitLabs is a good email client, and has a fancy extra window named mail ticker for unread mails:

But I never write into this mail ticker window or use it (I never need it to get focus). So its presence in the Task Switcher is undesired for me.
The simplest method will be preferred.
Open source tools preferred. Privative code and even not free ones accepted.
Methods for any Windows version are preferred. At least for Windows 7, please.
