Hi folks. This is why I like writing in books/wikis, because I always learn :) Now I writing in the book about the Interrupt Key and I come up with this guy I was not even aware of: CPUWatcher. It seemss very cool and useful. However, I am using it wrong, or there is too much dust on it. I want to ask if I am using it well before debugging and try to make it work. As the class comment says, I tried to do this: CPUWatcher startMonitoring. "process period 20 seconds, sample rate 100 msec" And then I evaluated in a workspace: [ true ] whileTrue: [ 1+1 ] It should stop that process when it is using 80% of the CPU, but it doesn't. The process is never stop and the image freeze. I then tried: CPUWatcher startMonitoring. "process period 20 seconds, sample rate 100 msec" CPUWatcher current threshold: 0.3. "change from 80% to 30%" I have the same results... any hints? Cheers Mariano