The shutdown function disables sends or receives on a socket.

More info on Shutdown in Windows Dev Center

Exported by

sizefilenameversion
134144CSteamworks.dllv1.25-1.35
1225216wbemcore.dll6.1.7601.17514 (win7sp1_rtm.101119-1850)
1567232steam_api.dll
119808CSteamworks.dllv1.9-1.31