Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     In DOS versions 3.1 and higher, DOS stores the Critical Error
     flag in the byte preceding the InDos flag. A call to function 34h
     thus effectively returns the addresses of both flags.
 
     TSR programs that make calls to DOS must monitor the InDos flag to
     ensure they do not interrupt a non-reentrant DOS function.
                                    -♦-