Anyway it prompted me to look into my book (BPMN Modeling and Reference Guide) and polish up a chapter for free distribution. So I put it on the BPM Focus web site (you’ll find it on Page 4 of the White Papers section). You’ll need to register to get access to the document, but dont worry that’s free. If you are already registered there, then you will just need to log in.
The reason for mentioning it within this context is the extensive use of Signals that I make within that Chapter. I meant to post this some time ago, and of course it slipped. The discussion on Signals just reminded me to get it out there.