Although ?BRK is not a CANDE command, standard Unisys terminal emulation software issues a break condition when a user enters ?BRK. When a break condition occurs, CANDE immediately notifies any output-capable open remote files assigned to the user's station, and terminates any listing or similar activity that can generate output to a station. For example, ?BRK terminates the FIND, MATCH, and LIST commands.

If a program has no instructions for recognizing a break condition, the program is discontinued with the break on output I/O error. If a program has instructions for recognizing a break condition, the action taken depends on the provisions in the program. For additional information, refer to the I/O Subsystem Programming Guide and the appropriate language reference manual.