Driver is a class which actually implements action reproducing. There are
different types of drivers (mouse driver, keyboard driver, button drivers, ...),
each of them represented by interface (button driver - by ButtonDriver interface, ...)
Package also contains some classes allowing to manage driver set.
Subpackages contain driver implementations.
Drivers is low-level API: they are not supposed to be used directly from test.
@since 04/17/2002