Yes, you can add up to 16 webcams or network IP cameras from a single computer, although your computer's hardware limitations (USB bus, CPU, memory) may further limit that number.
To add a camera, click on the + button underneath the cameras pane (for a screenshot go to
http://skjm.com/icam/help/#setup) and follow the instructions below:
For USB, FireWire, or Built-In webcams, you should be able to make your choice from the Audio and Video drop-down lists underneath the USB / FireWire / Built-In tab.
If you add a stand-alone network IP camera, you first need to find the correct MJPEG or JPEG URL for your camera. Enter it along with your camera's Login and Password (if any) into the iCamSource.
More detailed instructions are available at our Getting Started pages:
http://skjm.com/icam/help/#setup