Newps writes:
Ron Garret wrote:

1. What hardware does the current system run on?

Propietary. Built just for the FAA.

What operating system does it use?

Same.

2. How many flight plans per day does the current system handle?

Millions.

Are you certain about that? It sounds high by several orders
of magnitude. Every airplane in the world would have to make
about a hundred flights per day to get to a million flight
plans per day.

4. What actually happens when I'm waiting for my IFR release? Is the
computer involved, or is it just the controllers at that point?

Just the controllers.