Port 9100
When printing through a network, TCP/IP port number 9100 can be used to
send raw data.
WSD print
Printing is possible using the WSD (Web Service on Devices) function
installed in Windows Vista. A connection supports WSD, detects the printer
on the network automatically and connects. Specifying a WSD printer when
printing from Windows Vista allows printing using Web service for communi-
cation.
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Network Printing