[Cs3] observer with multiple subjects

[Mikhail Nesterenko]

CS3 students,

Classic Observer Pattern states that a single subject is observed by
multiple observers. However, this stackoverflow article discusses the
case where observer needs to watch multiple subjects. The article
states that this is still a modified Observer Pattern, with observer
having to register with each subject individually.

  http://stackoverflow.com/questions/4952933/what-is-the-opposite-of-the-observer-pattern

Thanks,
-- 
Mikhail