How can i use multiple usb video capture cards on one Windows 7 system to pull feeds from several different cameras at the same time? I am using Sabrent Video DVD maker USB capture cards (apparent copies of easycaps) , but the software like AMCAP only recognizes one at at time. I have other video viewing software that can view multiple but different capture cards at the same time, but needs to use the drivers provided with the cards. Any assistance would be appreciated.