WSASendTo

function WSASendTo(

  s: TSocket;

  lpBuffers: LPWSABUF;

  dwBufferCount: DWORD;

  var lpNumberOfBytesSent: DWORD;

  dwFlags: DWORD;

  lpTo: PSockAddr;

  iTolen: Integer;

  lpOverlapped: LPWSAOVERLAPPED;

  lpCompletionRoutine: LPWSAOVERLAPPED_COMPLETION_ROUTINE

):Integer;