# Compaq TCP/IP Services for OpenVMS
Sockets API and System Services Programming

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W
Warnings
compilation
Wildcard addressing
`write()` function
Write operation
broadcasting
with Sockets API function
multicasting
with system service or Sockets API call
out-of-band data
with $QIO system service
with Sockets API function
privileges required for UDP
sending datagrams
with $QIO system service
with $QIO system service
with Sockets API function
Writing a virtual block
See IO$_WRITEVBLK function