Hi Scott

my guess is this came about because if memory serves, you couldn't do
virtual hosts on the original HTTP server; this meant you were forced
to either provide an additional IP address for each host or use a
different port and I guess people just carried on doing this when
Apache became available.

2)I understand that two properties make a server instance unique, the host
name, and the port.  We only have on iseries(host),

I don't understand why people run multiple web instances in production
(it makes sense in development, so each developer can have a separate
sandbox... but in prod, there should only be one instance, IMHO)

What makes a unique server instance is that there's a separate copy of
Apache running with a separate configuration file, etc.   It's true that
incoming connections decide which instance they are connecting to by
choosing which IP address and port they connect to.

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