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If an interrupt is generated by the user just as a frame is being displayed, corruption may occur. Use the refresh command to redraw the screen.
If interrupts are enabled in a text frame and the oninterrupt descriptor does not evaluate to a valid command, then an interrupt generated just after the frame is canceled causes the frame to be canceled, when the result should just be a beep, the standard action when the close descriptor does not evaluate to a valid command.
If interrupts are enabled and the oninterrupt descriptor in effect does not evaluate to a valid command, then an interrupt generated when an application-defined command is being executed causes the current frame to close.
The action specified in the close descriptor is not interruptible. But the action specified in the close descriptor in a text frame is getting interrupted. After the interrupt, the action is incorrect.