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The returnKey command sends a statement typed into the Message box to the current card.
HyperCard sends the returnKey command to the current card when the user presses the Return key unless the insertion point is in a field, in which case HyperCard sends returnInField instead.
You can handle the returnKey message as follows:
Any return-separated list of built-in commands, user-defined handlers, or keywords that are part of a message or function handler.