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\details{
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\details{
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  Only one device is the \sQuote{active} device: this is the device in
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  Only one device is the \sQuote{active} device: this is the device in
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  which all graphics operations occur.  There is a \code{"null device"}
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  which all graphics operations occur.  There is a \code{"null device"}
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  which is always open but is really a placeholder: any attempt to use
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  which is always open but is really a placeholder: any attempt to use
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  it will open a new device specified by
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  it will open a new device specified by
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  \code{\link{getOption}("device")}).
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  \code{\link{getOption}("device")}.
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  Devices are associated with a name (e.g., \code{"X11"} or
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  Devices are associated with a name (e.g., \code{"X11"} or
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  \code{"postscript"}) and a number in the range 1 to 63; the
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  \code{"postscript"}) and a number in the range 1 to 63; the
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  \code{"null device"} is always device 1.  Once a device has been
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  \code{"null device"} is always device 1.  Once a device has been
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  opened the null device is not considered as a possible active device.
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  opened the null device is not considered as a possible active device.