While the notification about there being new answers to a question you're currently answering has been around for a while, I've noticed more recently Stack Overflow seems to be sending other updates to the client theses days:
- Indicating new questions since page load when you have a search page open
- Reputation auto updating
- Date fields auto updating (created date/ edit date)
So I was wondering technology/framework is Stack Overflow using to push these updates to the client? (Custom AJAX? A JS library?)
I've looked at this question's answer, but I don't see any specific mention.