newbie questions

[Chris Muller]

> In the end user application, is it fine to keep open a session to
> Magma?

Sure.
 
> After closing a Magma session, what become a local object of the
> persisted object?

They remain in place.  Where the in-memory object graph is truncated by
proxies, a message agitating a proxy will cause it to re-open the
session so the proxy can become the real object.

> If one re-open a session can the remote object be 'automatically'
> updated from the local object in case it changed?

Not automatically.  Updates to the repository can only be done via
transactions.

> With an open session, is it fine to read a persisted object outside
> of a
> commit:?

Absolutely.  Other than getting the root, you don't ever really "read"
an object, just send messages and proxies will be materialized.

> Is commit: only to be used when you want to persist an object?

To persist an object, you must use commit.