Note. The first ~2000 posts of this thread is mainly about EventRunner3 that is for the HC2. EventRunner3 is not developed further, but bugs are fixed as they are reported. For HC3, the version is EventRunner4, and is a QuickApp,. Please login or register to see this link. . Most of the 'Event Script" syntax and commands are still valid and old posts can be of use for new HC3 owners.   Here is an example of how to code in a "single instance / event" style. A style I'm using today for