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howto-html-en-20080722-2mdv2010.1.noarch.rpm

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NAME="AEN163">6.1. interface_id</H1
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>    This must be set to 'S' (capital ess). If not, the ENOSYS error
    message is placed in errno. The idea is to allow interface variants
    in the future that identify themselves with a different value.
    [The parallel port generic driver (pg) uses the letter 'P' to
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The type of interface_id is int.</P
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