Accessing Webcam Through MATLAB Code

I would like to access an external Webcam (USB). The command I am using is 'imaqhwinfo' but it seems like it can only find the built in one, and not the external connected through USB.
output=
InstalledAdaptors: {'gentl' 'gige' 'matrox' 'winvideo'}
MATLABVersion: '8.1 (R2013a)'
ToolboxName: 'Image Acquisition Toolbox'
ToolboxVersion: '4.5 (R2013a)'

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hey! perhaps you are getting this window, i need a Gige adaptors for 2012a , if you have can you please tell me from where to install? or from where to get them.
Before R2014a, the Gige adapters were supplied with the Image Acquisition Toolbox.

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