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Activates a device.
devSet(which=dev.next(), ...)
Returns what dev.set() returns.
dev.set()
An index (numeric) or a label (character). If neither, then a label corresponding to the checksum of which as generated by digest is used.
numeric
character
which
digest
Not used.
Henrik Bengtsson
devOff() and devDone(). Internally, dev.set() is used.
devOff
devDone