Though all people who flee conflict can be called refugees, refugee agencies commonly distinguish between refugees and internally displaced persons (IDPs) to decide who is covered by international law and receives assistance and who doesn't. For the most part, little assistance reaches a person fleeing a conflict until he or she crosses an international border. The United Nations High Commissioner for Refugees (UNHCR), established in 1950, distinguishes refugees and IDPs this way: "When a fleeing civilian crosses an international frontier, he or she becomes a refugee and as such is eligible to receive international protection and help. If a person in similar circumstances is displaced within his or her home country and becomes an internally displaced person, then assistance and protection