How to access multi input cameras (connected to bt878 chip) from vb.net

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VB

camera

I am using multi input camera(bt878 chip) and have connected two cameras to chip. When I try to get the driver description I am getting only one driver.When I send the command to preview the video I can see the first camera.If I change the frame rate I can see the second camera also.But I am not knowing how to access both the cameras at the same time.(If I try to connect the same driver with the different frame rate its accessing the first camera but not the second camera )

Here is the sample code

Sub LoadDeviceList()
    Dim strName As String = Space(100)
    Dim strVer As String = Space(100)
    Dim bReturn As Boolean
    Dim x As Integer = 0
    Do
        bReturn = capGetDriverDescriptionA(x, strName, 100, strVer, 100)
        If bReturn Then lstDevices.Items.Add(strName.Trim)
        x += 1
    Loop Until bReturn = False
End Sub

Private Sub OpenPreviewWindow()
    Dim iHeight As Integer = picCapture.Height
    Dim iWidth As Integer = picCapture.Width
    hHwnd = capCreateCaptureWindowA("camera1", WS_VISIBLE Or WS_CHILD, 0, 0, 640, 480, picCapture.Handle.ToInt32, 0)
    hHwnd1 = capCreateCaptureWindowA("camera2", WS_VISIBLE Or WS_CHILD, 0, 0, 640, 480, picCapture1.Handle.ToInt32, 0)
    If SendMessage(hHwnd, WM_CAP_DRIVER_CONNECT, iDevice, 0) Then
        SendMessage(hHwnd, WM_CAP_SET_SCALE, True, 0)
        SendMessage(hHwnd, WM_CAP_SET_PREVIEWRATE, 66, 0)
        SendMessage(hHwnd, WM_CAP_SET_PREVIEW, True, 0)
        SetWindowPos(hHwnd, HWND_BOTTOM, 0, 0, picCapture.Width, picCapture.Height, SWP_NOMOVE Or SWP_NOZORDER)
        btnSave.Enabled = True
        btnStop.Enabled = True
        btnStart.Enabled = False
    Else
        DestroyWindow(hHwnd)
        btnSave.Enabled = False
    End If

    If SendMessage(hHwnd1, WM_CAP_DRIVER_CONNECT, iDevice, 0) Then

        SendMessage(hHwnd1, WM_CAP_SET_SCALE, True, 0)
        SendMessage(hHwnd1, WM_CAP_SET_PREVIEWRATE, 66, 0)
        SendMessage(hHwnd1, WM_CAP_SET_PREVIEW, True, 0)
        SetWindowPos(hHwnd1, HWND_BOTTOM, 0, 0, picCapture1.Width, picCapture1.Height, SWP_NOMOVE Or SWP_NOZORDER)
        btnSave.Enabled = True
        btnStop.Enabled = True
        btnStart.Enabled = False
    Else
        DestroyWindow(hHwnd)
        btnSave.Enabled = False
    End If
End Sub