I use the “Wait until zero users logged in” trigger often, very handy. This morning, I have a specific task that I need to complete, and want to know sort of the opposite – I want an email when the number of users is greater than zero (as soon as somebody logs in). Can it be done?
There is not built-in functionality to do this, but you could do it with a custom script (you would have to write the script). At the following links you can see examples of integrating custom scripts into BatchPatch.