Lists of Open/Active Graphics Devices
A pairlist of the names of open graphics devices is stored in
.Devices. The name of the active device (see
dev.cur) is stored in
.Device. Both are symbols
and so appear in the base namespace.
.Deviceis a length-one character vector.
.Devicesis a pairlist of length-one character vectors. The first entry is always
"null device", and there are as many entries as the maximal number of graphics devices which have been simultaneously active. If a device has been removed, its entry will be
""until the device number is reused.
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