SSLPort vs Port (SSLListen vs Listen)

[Lt. John J. Dunbar]

Can someone comment on these options.

If I want to specify encryption as required or always, is it necessary that I have at least one SSLPort open?

Does the Port/Listen directive mean that cups will be listening for both regular and encrypted connections on the given port/interface while SSL only listens of encrypted connections?

Can I specify Port 631, SSLPort 631?

Do these options apply to regular printing operations, browsing, or both?