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The popup key is a flag indicating whether or not to show a pop-up window at the start of the frame. For a frame belonging to the inbox this means that the associated event is executed. For a frame of a regular story, a message dialog appears informing the user that new content is available for that story, which can trigger the user to activate the relevant story button.
The once key is a flag indicating whether or not an event must be executed only once during a time frame.
A condition can be added to a story (or inbox) frame; the associated event will only be executed if this condition is fulfilled. For now, the only supported condition is one based on a forecast published by the user. A condition must be specified according to:
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