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Message: [QUOTE="Richard Bos, post: 4081766"] I don't know if this is still true, but at least in the MS-DOS days it was not system() which had the problem, but the command shell. Command.com always returned 0 to _its_ calling process, no matter what a called program returned to command.com. Thus, regardless of the implementation, system() never got anything but 0 to return to you in the first place. The compiler writer would have had to implement a completely new command shell to load and run programs, which was a bit too hairy for most to bother with. Richard [/QUOTE]