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+.th TIU IV 10/28/73
+.sh NAME
+tiu \*- Spider interface
+.sh DESCRIPTION
+Spider
+is a fast digital switching network.
+.it Tiu
+is a directory which contains
+files each referring to a Spider control
+or data channel.
+The file /dev/tiu/d\fIn\fR refers to data channel \fIn\fR,
+likewise /dev/tiu/c\fIn\fR refers to control channel \fIn\fR.
+.s3
+The precise nature of the UNIX interface
+has not been defined yet.
+.sh FILES
+/dev/tiu/d?, /dev/tiu/c?
+.sh BUGS