>>>Even a better example is how a Windows message queue processes messages. Ever use Spy++ from the VS tools to view messages that an app receives? It's amazing that the whole thing doesn't slow to a crawl.
>>
>>Boy, have you got that right! Whenever I work with that feature, I have to remember to mark what messages I'm interested in. Otherwise, I can't see what's going on.
>
>Same with regmon.exe from www.sysinternals.com. Little did you know how hard the registry gets thrashed.

< shudder > Please be kind and don't tell me. I'm still recovering from the time when one of the folks in my department trashed Win95s because they didn't understand the dual boot (with Win 3.1) I was running.