This Force Sense was a unique capability that allowed Force Sensitive beings to detect the Yuuzhan Vong and effect them with Force Powers, it is believed that this was caused by the Yuuzhan Vong returning to a symbiote existance with Zonama Sekot which was the "Seed" of their Original Homeworld, however a Force User (Darth Deus) has been shown to have used it long before then in a oneway link.