## Input/Output Device Driver Reference

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### Glossary - N

N

named pipe - A named buffer that provides client-to-server, server-to- client or duplex communication between unrelated processes. Contrast with unnamed pipe.

notification callout - The feature that provides for a routine to be called on completion of an input/output request. See also notification routine.

notification routine - The routine indicated in an input/output request block to be called on completion of that request. See also notification callout.

null-terminated string - A string of (n+1) characters where the (n+1)th character is the "null" character (X'00') and is used to represent an n- character string with implicit length. Also called a "zero-terminated" string or an "ASCIIZ". string.