Question about Watcher Attributes

In the Tutorial.pdf file i see this note towards the last 2/3 of page 11
which says:

	"Beginning with version 0.60, Event additionally provides the base
attribute data.  It is intended not for configuration
	 but for user controlled data storage".

My assumption is that this "data" would be passed on to the watcher as a
parameter of the callback when the watcher
is invoked.

I've looked a the Event.pod which comes with version 0.73, but fail to see
any mention of "data" there.

First off, is this "data" actually implemented (and is it like I suspect)?
Yes, I could dig through the code, but I don't
have that kind of time right now.

Also, are there more examples (someplace) where I can get some working stuff
using Event?

Thanks in advance....

       -r-