Two people on separate PCs are sending instant messages to each other through
Ajax on a common server. The sender posts a message and it gets stored in the
database. How does the receiver get that message on the other machine? I can
envision a polling mechanism whereby the receiver's client periodically polls
the database through Ajax to see if a new message is there. But how does one do
it through interrupts, without polling? Any ideas appreciated.
Leo
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