para que se puedan conectar mas de un usuario tienes crear un servidor que permita conexión multiple te pongo un codigo para que permita la conexión de mas de un usuario:
Cita: 'Procedimiento para poner el servidor en escucha
Sub iniciarServer()
WinsockServer(i).LocalPort = 895
On Error GoTo cont
WinsockServer(i).Listen
cont:
a = 0
End Sub
Private Sub WinsockServer_Close(Index As Integer)
WinsockServer(i).Close
WinsockServer(i).Listen
End Sub
Private Sub WinsockServer_ConnectionRequest(Index As Integer, ByVal requestID As Long)
Dim i As Integer
i = Index
Load WinsockServer(WinsockServer.UBound + 1)
If WinsockServer(WinsockServer.UBound).State <> sckClosed Then
WinsockServer(WinsockServer.UBound).Close
End If
WinsockServer(WinsockServer.UBound).Accept requestID
End Sub
Private Sub WinsockServer_DataArrival(Index As Integer, ByVal bytesTotal As Long)
Dim data As String
WinsockServer(Index).GetData data
End Sub
Private Sub WinsockServer_Error(Index As Integer, ByVal Number As Integer, Description As String, ByVal Scode As Long, ByVal Source As String, ByVal HelpFile As String, ByVal HelpContext As Long, CancelDisplay As Boolean)
End Sub
espero que te sirva.
no puse comentarios porque estoy apurado si no entiendes algo. preguntamen.