Persistent connections questions

[haplo]

1) anyone have experience with big number of connections? does it work well?
2) is there a way to make Persistent connections work with php?
3) i couldnt find any example of how to feed the client with data without letting the client request it.
4) does anyone have experience with feeding coordinates ? any source code or any ideas how to implement ?
for example 2 different applications (on different machinese) can move a simple view , each application can see the other view moving


Thnx

[Evangelus]

I had some experience with a small number of connections, and it didn't work very well. I was using PHP. I abandoned that approach before I got anywhere near a production quality system.

I wrote about it here:
http://philwallach.com/2007/07/02/openlaszlo-replacing-a-persistent-connection-with-an-idle-loop/#more-70

[haplo]

thnx
helps a lot