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returnInField
The returnInField command places a return character at the position of the insertion point in a field.
If the autoTab property of the field is true and the insertion point is on the last line of the field and the field is any type except scrolling, the returnInField command does not insert a return character but instead sends the tabKey command to the field.
HyperCard automatically sends the returnInField command to a field when the user presses Return and the insertion point is in the field.
You can handle the returnInField 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.