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what is WSD?
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You have supplied no context, so take your pick: http://www.acronymfinder.com/WSD.html
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Well, I guess there are several terms which have such an abbreviation but here's the one I've found. Web Services for/on Devices (WSD) is a Microsoft application programming interface used to enable the program connections to the web service enabled devices (printers, scanners, file shares, etc.). They conform to the Devices Profile for Web Services (DPWS). It's a framework that is an extensive replacement for older Windows networking functions.