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  number and name of the active device, or 1, the null device, if none
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  number and name of the active device, or 1, the null device, if none
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  is active.
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  is active.
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  \code{dev.list} returns the numbers of all open devices, except device
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  \code{dev.list} returns the numbers of all open devices, except device
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  1, the null device.  This is a numeric vector with a
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  1, the null device.  This is a numeric vector with a
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  \code{\link{names}} attribute giving the device names, or \code{NULL} is
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  \code{\link{names}} attribute giving the device names, or \code{NULL} if
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  there is no open device.
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  there is no open device.
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  \code{dev.next} and \code{dev.prev} return the number and name of the
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  \code{dev.next} and \code{dev.prev} return the number and name of the
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  next / previous device in the list of devices.  This will be the null
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  next / previous device in the list of devices.  This will be the null
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  device if and only if there are no open devices.
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  device if and only if there are no open devices.