> 1) How do you do that if your server is behind a router?

So what? Router is just a computer with firewall inside. Usually it
is based on Linux. CISCO is different. Consult network engineers.

> 2) My app relies heavily on events because they enable displaying changes in
> real time.
> Also, how would you install a CS and an SS on the same computer?

Why on the same? You don't have enough money to buy another one?

> You'd need to have to separate DB files!

Yes. And what? Have you ever heard about replicators? Particulary
IBPhoenix Replicator.

SY, SD.