History of HVC research — an Overview -- HVC/IVC Maps and HVC Distribution Functions -- Kinematics of HV and IV Gas -- Interemdiate-velocity Clouds -- HVCS Related to the Magellanic System -- High-velocity Hi Gas in External Galaxies -- The Large- and Small-scale Structure of HVCs -- Ionized Gas Associated with HVCs -- The Coldest Phase in Halo High-velocity Gas: Dust and Molecules -- Distanc…