I'm trying to improve my macromanagment speed and I recognize, that I never use the Alarm sound cues. There is a hotkey to jump to the last cue, but I can't quite figure out how it works. You can jump to the last alarm with Spacebar and an alarm can be if a unit was created, you were attacked somewhere, minerals or vespin gas resources are finished in one location etc.

My first impression was that the alarm system works like a stack. The newest event will be put on top on the stack. If you press Spacebar, you will get to the top of the stack, then to the second element etc. . I thought that if I jumped to an element it would get pushed from the stack and I couldn't reach it anymore when pressing Spacebar. But it appears to loop. That means if I press Spacebar a couple of times and see the latest events and then do some other stuff. I come back and the same events are still in the Stack.

Anyone uses the spacebar hotkey frequently and figured out how it works? Thanks!