the 4th parameter of 'recv' function, 0?

in the Bluetooth sample 'bthcxn' of the Windows SDK v6.1 :
iLengthReceived = recv(ClientSocket,
pszDataBufferIndex,
(CXN_TRANSFER_DATA_LENGTH -
uiTotalLengthReceived),
0);
From the MSDN http://msdn.microsoft.com/en-us/library/ms740121(VS.85).aspx
I know there are three values of the 'flag' in function recv.
MSG_PEEK 0x1
MSG_OOB 0x2
MSG_WAITALL 0x4
what is '0' represent for? How it influence the behavior of the function
'recv'?
Is there something else I can refer to?

Best Regards!


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