Info about a single prop and its current status.
Amount of hit points left on prop.
Value of prop's parameter which is handled depending on the kind of prop this is. For example, a door is 0 in the closed position and 1 in the open position.
Orientation the prop is placed in. 0 for floor mount (no orientation), 1 for facing up, 2 for facing right, 3 for facing down and 4 for facing left.
Location of the prop connected as a trigger (pressure plate, door, etc.). If there is nothing connected, this is null. NOTE: never assume a prop is actually still at this location.