Web simulation

[Kaichuan He <he@expert.cc.purdue.edu>]

Dear ns gurus:
	I'm a new user of ns2. I'll go to do some simulation
in ns2. I've read the example script:

ns/tcl/ex/simple-webcache.tcl

	One thing I dont understand is: Why does the web client
and web server share a common "pgp" (Page pool) which is a
page generator. It seems to me that only client needs to bind
with a pgp, and URL requests stream go through  client->cache->server,
why does server needs explicit "page generator"?

Thanks,

Kevin