Document revision date: 30 March 2001

## OpenVMS I/O User's Reference Manual

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U
UDA50 disk adapter
UNI
user to network interface
Unload function
disk
magnetic tape
User to network interface (UNI)
W
Write attention AST function
Write breakthrough function
Write end-of-file function
magnetic tape
message
Write protection
hardware
X
XQP (extended QIO processor)

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