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INT 23 - DOS - CONTROL "C" EXIT ADDRESS
   When DOS detects Ctrl-C or Ctrl-Break, it sends the string ".followed by
   CRLF to the calling process's standard output, then invokes this interrupt.
---DOS 1.x---
Return: AH = 00h abort program
        if all registers preserved, restart DOS call
---DOS 2+---
Return: return via RETF 2 with CF set
            DOS will abort program with errorlevel 0
        else
            interrupted DOS call continues
Note:   MSDOS 1.25 also invokes INT 23 on a divide overflow (INT 00)
SeeAlso: INT 1B