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.
Variable Refrigerant Volume Systems. The variable refrigerant volume systems (VRV/VRF) is basically a large multiple split system. The system can comprise of several indoor fan coil units, matched to one or more outdoor condensing units. The VRV / VRF systems can achieve high efficiencies through heat recovery and accurate temperature control.