I read your problem. And I have the same one.
I am designing a network application with php.
When it scan the network, it take to long time, and browsers will time-out and disconnect itself. I don't know if possible to launch 2 scripts, one on the server side and the other on the client side.
I tried to send information to the browser but it don't receive it.
I thought to develop a C script, but I don't think so the C can manage easly the SNMP protocol
DId you solve your problem?
Can you help me?
Thanks a lot
Sébastien.