The Ports tab displays a list of the current port service mappings, and lets you enable or disable UPnP port forwarding. To enable or disable UPnP port forwarding: Set UPnP port forwarding to ON to allow UPnP devices on your Fiber network to set their own port forwarding rules.
VRML (Virtual Reality Modeling Language) is a language for describing three-dimensional (3-D) image sequences and possible user interactions to go with them.
Re: Deference between VR and Non VR lens. VR stands for vibration reduction and is what Nikon calls it's version of optical image stabilization. Image stabilization basically counters the camera shake you get from holding the camera, making it so you can use slightly faster shutter speeds than without it. Non-VR lenses do not have this feature, but cost less than VR lenses.