i believe he wants to let roborealm access an internet camera, not watch roborealm's camera over the internet.
i'm not sure if this is doable unless rr explicitly supports it.
you will need your host camera to sends its data via some kind of protocol. for example, video stream servers usually use mms. next, you must make roborealm understand this stream. if it is directly supported, that should be fine, enter the stream address and voila! roborealm watches the remote camera.
however, if it doesn't have support for that protocol, you must find a program that connects to that stream, identifies itself as a camera, and presents to the OS the stream data as camera info. This way, you can trick roborealm (and any other software that uses a camera) into believing the remote stream is actually a local camera.