Does GeneratorLinks work with a server before insert trigger?

I have a generator and a before trigger to assign it to the PK of a table.
I found that IBO incremented the generator before inserting and since I did
not include the field involved in the INSERT statement, the generator on the
server incremented the generator again (since the field is null).

My question is: Is it a good idea to increment the generator from the
client? Will there be a keyviol problem where two clients are simultaneously
incrementing the generator?

I suppose not since the generator on the server should be serialized.

However, is it possible for IBO to:

Perform insert (omitting the PK which is generated using server trigger),
then after that, loads up the value of this field from the server.

Thanks