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GETEVENTCOUNTER
This function return one status line with the current values of the
event counters. The event counters are useful to avoid polling by
delaying a poll until something has changed. The values are decimal
numbers in the range 0
to UINT_MAX
and wrapping around to
0. The actual values should not be relied upon; they shall only be used
to detect a change.
The currently defined counters are are:
ANY
Incremented with any change of any of the other counters.
KEY
Incremented for added or removed private keys.
CARD
Incremented for changes of the card readers stati.