Note: This is a work in progress and will be formatting errors. Read more about the project on the home page.
HyperCard sends the
openBackground message to the current card just after a user (or script) goes to a card whose background differs from the background of the most recent card.
Any return-separated list of built-in commands, user-defined handlers, or keywords that are part of a message or function handler.
Version 0.7b1 (March 24, 2022)
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