[Zope] What's the default database connection status at Zope startup?

[Constantin Teodorescu]

I have different Z PyGreSQL database connection objects.

What will be the default connection status when I'll start Zope (at boot
process).
Should the connections be opened manually?
If yes, is there a "startup folder" like object?
Are they opened by Zope when a client access a Z SQL method at the first
time?
The connections are opened just one for the Zope server or one per
client?

I'm asking those questions because I intend to build an Intranet with
20-30 users that will heavily use a PostgreSQL server.
I have searched the ZSQL documentation and didn't find any clue. Maybe
that kind of questions would find a better place in a FAQ.

Best regards,
-- 
Constantin Teodorescu
FLEX Consulting Braila, ROMANIA