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Default: VIEWPORT 0 1 0 1 0 1 Define the viewport extents in normalized device coordinate space (scale 0 to 1) to be vxmin..vxmax in the x direction, vymin..vymax in the y direction, and vzmin..vzmax in the z direction. These six parameters must be in the range 0..1. The default viewport at SLIDES startup is determined by the default values of the SIZE command, which are set to select a vertical 8.5 x 11 inch page frame; this corresponds to "VIEWPORT 0.0 0.77273 0.0 1.0 0.0 1.0" (vxmax = 8.5/11.0 = 0.77273). The viewport must be inside the device space established by default or explicitly by the SIZE command. If this is not the case, the VIEWPORT request is ignored and an error message is issued.