WhatisHang

from: http://www.nirsoft.net/

Some hang problems cannot be detected properly by WhatIsHang, for
example:
Programs without any user interface.
When the program hangs because one thread waits for the Other
one. (In this case, WhatIsHang will show the details of the waiting
thread, but the problem might be in the other thread)
But... Starting from version 1.05, you can use the experimental 'All
Threads' report to display the information about all running threads.
When the entire system hangs - In this case WhatIsHang won't be
able to run...


what is hang?
http://www.mediafire.com/download.php?tvj73ad5l4g4y1h