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[GTVL\]DEVICE [Dev_Type [Mode]] [/OUTPUT Dev_Name]
Without argument, DEVICE displays the current working graphic device.
With a graphic device type as argument, directs the graphic output to it
and sets default values for the plot region location and device physical
limits. The basic unit is 1 cm for hardcopies. All plots to interactive
devices are made with some pre-computed factor to match the screen size
to the Plot Page size, defined by command SETPLOT_PAGE (default size is
an A4 format page, 30 by 21).
Use DEVICE ? to get the list of recognized graphics devices or DEVICE
type ? to get the list of modes on a given device.
/OUTPUT Dev_Name option allows you to direct the graphic output to some-
thing else than your own terminal (TT:). Note that some specific devices
will not support this option: this is currently the case for X-Window