Re: [ros-dev] [ros-diffs] [cfinck] 39353: Gabriel Ilardi([e-mail]) - Allow only one instance ofTask-Manager to be run at the same time See issue #3976 formore details.

[Sarocet]

Using a mutex the taskmgr won't be able to open if there's another
unresponsive instance, which Windows allow.

Also, note that whatever method is used, it will be deemed as "a way of
disabling Ctrl+Alt+Supr".
http://blogs.msdn.com/oldnewthing/archive/2006/06/20/639479.aspx