    BREAK=ON
or
    BREAK=OFF 

BREAK=ON causes DOS to check for a Ctrl-Break key combination whenever it 
performs ANY function for a program.  This allows you to abort programs 
that are executing more frequently than when the BREAK condition is off. 

BREAK=OFF causes DOS to check for a Ctrl-Break key combination ONLY when 
DOS is performing input or output to the console (screen or keyboard) or
the printer. This limits the frequency that the Ctrl-Break key combination 
will effectively abort the executing program. BREAK=OFF is the default.
