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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
identify itself.]
The type of interface_id is int.</P
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