How should I implement "interactive refresh" (I don't even know how I should call it) where one visitor's action (klicking a link, submit button etc. - everything will do) activates page refreshing of other visitors on the same page?
I know how to implement an automatic, periodic refresh but I would like it to refresh only when someone has really made a change to the page (it would be kind of interactive multiuser application).
If it's not possible with php, is there some other way?
- Lennart