How can I import 2 cameras at the same time?

Hey guys, i have 2 cameras including laptop cam and webcam.

But when I code in Command Window, that result just show 1 device while I was open 2 cam.

So, how can i code to show 2 cams at the same time.

My code in editor:

% show webcam

cam1 = videoinput('winvideo', 1,'MJPG_640x480');

% only capture one frame per trigger, we are not recording a video

cam1.FramesPerTrigger = 1;

% output would image in RGB color space

cam1.ReturnedColorspace = 'rgb';

% tell matlab to start the webcam on user request, not automatically

triggerconfig(cam1, 'manual');

% we need this to know the image height and width

vidRes1 = get(cam1, 'VideoResolution');

% image width

imWidth1 = vidRes1(1);

% image height

imHeight1 = vidRes1(2);

% number of bands of our image (should be 3 because it's RGB)

nBands1 = get(cam1, 'NumberOfBands');

% create an empty image container and show it on axPreview

hImage1 = image(zeros(imHeight1, imWidth1, nBands1), 'parent', handles.axes3);

% begin the webcam preview

preview(cam1, hImage1);

handles.vid1=cam1;

guidata(hObject, handles);