Suppose we received unsolicited notifications?
Electrical Engineer working on next Space Station
is notified that a change on a CAD design means his
large voltage transformer will no longer fit. A lower
voltage is necessary.
A general contractor is notified that a proposed city
regulation will be violated by current house project.
Building my Web2.0 slides, I receive notification
of similar events this month. Of other people building
slides. Of pictures I could use.
Writing a paper on "Web Service Planning",
I am notified of a new conference. A new paper. Other people
writing at the same time.