Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 21h Function 0Bh
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     If CTRL+C is detected, an Int 23h is executed.
 
     If the standard input is not redirected and CTRL+C is detected at
     the console, an Int 23h is executed. If the standard input is
     redirected, CTRL+C is detected at the console, and BREAK is ON, an
     Int 23h is executed.
 
     If a character is waiting, this function will continue to return a
     true flag until the character is consumed with a call to Int 21h
     Function 01h, 06h, 07h, 08h, 0Ah, or 3Fh.
 
     This function is equivalent to IOCTL Int 21h Function 44h
     Subfunction 06h.
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