How can I change their mode to binary?

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I'm writing a ``filter'' for binary files, but stdin and stdout are preopened as text streams. How can I change their mode to binary?

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There is no standard way to do this. On Unix-like systems, there is no text/binary distinction, so there is no need to change the mode. Some MS-DOS compilers supply a setmode call. Otherwise, you're on your own.

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How can I change their mode to binary?
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What is the difference between text and binary I/O?
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How can I arrange to have output go two places at once, e.g. to the screen and to a file?
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