NOVELTY - The grate has two elongated rockers (1) positioned parallel to one another, where the rockers include a lower surface and a planar upper surface. The rockers rotate about longitudinal axes to form a void allowing material to pass through the grate when the rockers are in a position and close to the void when the rockers are in another position. The rockers displace the material away from the grate in the former position. The rockers provide a crushing force on the material when rotated between the positions. A coolant loop (6) allows flow of coolant through the rockers.    USE - Active grate for use in a high temperature integrated partial oxidation gasification/vitrification waste treatment system for recovering an energy value from organic portions of heterogeneous feed stocks while converting inorganic portions to a safe and usable form.    ADVANTAGE - The grate allows materials processed in the chamber of the high temperature system to be crushed and reduced in size, thus facilitating the transfer of the materials to another chamber of the high temperature system. The grate allows cooling effects of the water to be realized without generating excessive pressure changes in the rockers. The grate can effectively control and regulate rate of flow of materials from a gasification unit to a vitrification unit in a uniform manner.    DETAILED DESCRIPTION - The coolant is selected from a group consisting of water, steam, ethylene glycol, paraffin based heat transfer fluid, mist of liquid droplet, silicon based heat transfer fluid or hydrocarbon heat transfer fluid. INDEPENDENT CLAIMS are also included for the following:    (1) a method for allowing material to pass from a chamber of a high temperature system to another chamber of the high temperature system    (2) a high temperature gasification/vitrification waste treatment system.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of an apparatus for processing feedstocks containing organic materials.    Elongated rocker (1)    Frame (3)    Rocker arm (4)    Shaker (5)    Coolant loop (6)