Where left, right, top and bottom are positive or null integers which define bands at the edge of the screen. left defines a band on the left of your screen of width left, right defines a band on the right of your screen of width right, top defines a band on the top of your screen of height top and bottom defines a band on the bottom of your screen of height bottom. The unit is the pixel and the default is 0 0 0 0. These areas define additional reserved space to the reserved space defined by some ewmh compliant applications. This is used to compute the Working Area. See the Extended Window Manager Hints section for a definition of the Working Area.