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Message: [QUOTE="Default User, post: 2545008"] Larry I Smith wrote: Yes. Here's what it says in the C standard. [#3] If the argument is a null pointer, the system function returns nonzero only if a command processor is available. If the argument is not a null pointer, and the system function does return, it returns an implementation-defined value. So anything it does return in the example given is going to be specific to the implementation. So, as many have said, the OP needs to move to a newsgroup dedicated to his platform. Brian [/QUOTE]